How to Set Up a Nano Aquarium (Under 50L)

Setting up a nano aquarium under 50 litres is one of the most rewarding ways to enjoy the underwater world, even in a small apartment or office. A carefully planned nano tank can become a vibrant living display full of colour and personality. It does, however, demand attention to detail: small volumes of water react quickly to changes, so every decision matters. This guide walks you through every step, from planning and equipment to stocking and long‑term care.

Why Choose a Nano Aquarium?

A nano aquarium is generally considered any tank under 50L. Far from being “just a small tank,” a well-designed nano setup can host beautiful aquascapes, shrimps, and small fish that would feel lost in a larger aquarium. It can sit on a desk, countertop, or shelf and become a relaxing focal point in your daily environment.

Smaller tanks are often seen as beginner-friendly because they cost less and take up less room. In reality, a nano aquarium is more sensitive to instability. A small change in temperature, a bit of overfeeding, or a missed water change has a greater effect than it would in a 200‑litre tank. Understanding these limitations and planning properly will help you create a healthy, stable system that thrives for years.

At MB Store you will find a full range of aquariums, filters, lighting, and accessories ideally suited for nano setups. Choosing reliable equipment from the start reduces frustration and makes maintenance easier. As you read through, you can consider which products would best match your goals, budget, and available space.

Planning Your Nano Aquarium

Before buying anything, define the purpose of your nano aquarium. Do you imagine a densely planted aquascape, a shrimp colony, or a small community of peaceful nano fish? The stocking plan determines the tank size, filtration, and even the type of substrate you should choose.

Start by deciding where the aquarium will be placed. A stable surface is essential; even a 30–40L tank with water, substrate, and decor can weigh over 40 kg. Avoid locations directly in front of windows or heaters. Direct sunlight encourages algae and can cause temperature swings, while radiators or air conditioners can make it difficult to keep a stable temperature.

Think about viewing height. Ideally, the aquarium should be at or slightly below eye level when you are seated, so you can comfortably enjoy the fish and plants. Also consider access: you should be able to reach into the tank for maintenance without standing on a chair or moving furniture around every time.

Set a realistic budget. A nano tank does cost less than a large aquarium, but good filtration, a heater, quality substrate, and a proper light are still important. MB Store offers nano-sized filters, adjustable heaters, and modern LED units that are efficient and tailored to smaller volumes, helping you stay within budget without sacrificing reliability.

Choosing the Right Aquarium and Equipment

The aquarium itself is the heart of the project. For beginners, a rectangular glass tank between 20 and 45 litres is usually easiest to manage. Very tiny tanks (below 10L) look attractive but provide little room for error and are best for experienced keepers or specialised setups such as shrimp-only tanks or small planted scapes without fish.

When choosing a tank, pay attention to build quality: clean silicone seams, thick enough glass, and a solid, level base. Rimless tanks offer a modern, open look that showcases aquascapes brilliantly, while tanks with plastic rims often come in all‑in‑one kits. Both types can work well when paired with suitable equipment.

The standard equipment list for a nano aquarium under 50L includes:

• Filter (internal, hang-on‑back, or small external)
• Heater (if you keep tropical species)
• Lighting appropriate for plants
• Substrate (inert sand/gravel or active soil)
• Water conditioner and test kits
• Basic tools: nets, siphon, algae scraper, and aquascaping tweezers

MB Store carries complete nano kits as well as separate tanks and components, so you can either buy a ready-to-use set or assemble a custom system. Kits are convenient for first‑timers, while custom choices allow you to fine-tune lighting and filtration for more demanding plants or fish.

Filtration, Heating, and Lighting Explained

In a nano aquarium, filtration is especially important because the water volume is small and waste can accumulate quickly. The filter has three key roles: mechanical filtration (removing particles), biological filtration (hosting beneficial bacteria that convert harmful ammonia), and, if needed, chemical filtration (using carbon or other media to remove impurities).

Common nano filter types include:

• Internal filters: Compact, easy to install, and often included in kits. Good for most 20–40L tanks.
• Hang-on-back filters: Hang on the rim of the tank and offer more media capacity while saving space inside the aquarium.
• Small external filters: Provide excellent biological filtration and keep equipment out of sight, ideal for aquascapes.

The flow rate should generally be 5–10 times the tank volume per hour, but in nano setups you must also consider the comfort of tiny fish and shrimp. Gentle, well-diffused flow is better than a harsh current. Sponge pre-filters on the intake help protect shrimplets and fry from being sucked in.

For tropical fish and most ornamental shrimp, stable temperature is crucial. A reliable, adjustable heater matched to the volume of the tank (usually 25–50W for most nano aquariums) keeps the water between 24–26°C for common community species. In such a small volume, cheap heaters that fluctuate widely in temperature can quickly stress or even kill inhabitants, so this is not the place to cut corners.

Lighting is another critical component, especially if you want a planted tank. Modern LED units designed for nano aquariums offer energy efficiency, slim design, and a balanced spectrum suitable for plant growth. A photoperiod of around 6–8 hours per day is usually a good starting point for new setups to reduce algae risk. Later, as plants grow and the tank stabilises, you might extend lighting to 8–10 hours if needed.

MB Store provides a selection of nano LED fixtures, clip‑on lamps, and compact filters from leading brands, so you can match the light intensity, colour temperature, and filter power to your exact aquarium size and layout.

Substrate, Hardscape, and Plant Selection

The substrate forms the foundation of your nano aquarium. In planted tanks, it is not just decorative; it also supports root growth and nutrient storage. There are three main substrate categories:

• Inert sand or gravel: Does not alter water chemistry, good for fish‑only setups and hardy plants. Nutrient support must come from root tabs or water column fertilisers.
• Active soil: Designed for planted aquariums; it releases nutrients and often buffers water toward slightly acidic, soft conditions. Ideal for many plants and some shrimp species.
• Mixed systems: A base layer of nutrient substrate covered with sand or fine gravel for aesthetics.

Hardscape includes rocks, driftwood, and decorative elements that create structure. In a small aquarium, scale is essential: select smaller, delicate pieces rather than bulky rocks that overwhelm the layout. Try to build one or two focal points and leave open swimming space. Arranging the hardscape in a triangular or U‑shaped composition can make the tank look deeper than it truly is.

For plant selection, focus on species that are well suited to small tanks and your chosen light level:

• Foreground: dwarf hairgrass (Eleocharis), Monte Carlo (Micranthemum), small crypts.
• Midground: Anubias nana, Bucephalandra, Java fern on wood or rocks.
• Background: stem plants such as Rotala, Ludwigia, or Hygrophila species.

Epiphyte plants (those that attach to wood and rock) are perfect for nano aquariums because they grow slowly and can be positioned exactly where you want them. In low‑tech setups without added CO₂, choose hardy plants like Java fern, Anubias, mosses, and easy stems.

All of the above substrates and hardscape items, along with a wide selection of aquatic plants and decor, are available through MB Store, making it easy to design a balanced, visually appealing aquascape tailored to your nano tank.

Water Preparation and Cycling the Aquarium

Before adding any living creatures, your nano aquarium must go through a biological cycle. This process establishes a population of beneficial bacteria that convert toxic ammonia (produced by fish waste and decaying food) into nitrite and then into the less harmful nitrate. In a small system, proper cycling is absolutely essential for long‑term stability.

Begin by filling the tank with water treated with a quality water conditioner to neutralise chlorine and chloramine. If your tap water is extremely hard or soft, you may need to mix in reverse‑osmosis water or use specific conditioners, especially for sensitive species. Always verify parameters—pH, GH, KH, ammonia, nitrite, and nitrate—using reliable test kits.

Once the aquarium is filled, the filter is running, and plants are in place, you can start the cycling process. There are two main approaches:

• Fishless cycling: Add a measured source of ammonia (commercial ammonium solution or fish food) and allow bacteria to colonise the filter media. You test the water regularly until ammonia and nitrite reach zero within 24 hours after dosing.
• Seeded cycling: Use filter media or bottled bacteria from an established tank to speed up the process. This still requires testing but can significantly reduce cycling time.

During cycling, keep lights on a reduced schedule—around 6 hours—to limit algae growth before plants have fully adapted. Be patient; depending on method and temperature, cycling usually takes between 2 and 6 weeks. Only when both ammonia and nitrite consistently drop to zero and nitrate appears at low to moderate levels is the tank ready for its first inhabitants.

MB Store stocks beneficial bacteria products, test kits, and conditioners designed for freshwater aquariums, helping you manage and monitor the cycle with confidence. Investing in these tools early makes it much easier to keep your nano system healthy over time.

Choosing Fish and Invertebrates for Nano Tanks

Stocking is where many nano aquariums fail, not because of bad intentions, but due to overestimating how many animals can comfortably live in a small volume. Responsible choices start with fully grown size, behaviour, and social needs of each species.

Suitable fish for nano aquariums under 50L include:

• Small rasboras (e.g., chili rasbora, neon green rasbora)
• Microrasboras and dwarf danios
• Endler’s livebearers (males only to avoid overpopulation)
• Small tetras like ember tetras
• Betta splendens (in a species-only setup with careful planning)

All schooling fish should be kept in adequate groups, usually 6–10 individuals, to reduce stress and encourage natural behaviour. In nano tanks, this means choosing one main schooling species rather than mixing many types.

Invertebrates are excellent residents for nano aquariums:

• Neocaridina shrimp (e.g., cherry shrimp) in various colours
• Caridina shrimp for experienced keepers with stable, soft water
• Nerite snails for algae control
• Small horned snails or ramshorn snails (with population monitoring)

Shrimp do best in densely planted tanks with plenty of hiding spots. Many small fish will coexist peacefully with shrimp, but some may prey on shrimplets. If breeding shrimp is a priority, consider a shrimp-only tank or choose very small, peaceful fish.

A useful rule of thumb is to think in terms of bio-load rather than a fixed number of fish per litre. A lightly stocked nano aquarium is more stable and easier to maintain. Add animals slowly—perhaps starting with a clean-up crew of shrimp and snails, followed by a single school of nano fish—so the biological filter can adapt.

MB Store can help you match compatible species, providing not only equipment but also guidance on suitable livestock combinations for smaller aquariums.

Step-by-Step Setup Process

To bring everything together, here is a practical sequence for setting up your nano aquarium under 50L:

• 1. Prepare the location
  Clean and level the stand or surface. Place a foam mat or dedicated aquarium pad under the tank if recommended by the manufacturer.
• 2. Rinse hardscape and substrate
  Rinse sand and gravel thoroughly until the water runs mostly clear. Do not wash active soils too aggressively, as this can release excessive fine particles. Rinse rocks and wood to remove dust, and soak driftwood if it tends to float.
• 3. Add substrate
  Create a gentle slope from back to front to enhance depth. A deeper layer at the back supports background plants, while a thinner layer at the front keeps the layout open.
• 4. Arrange hardscape
  Position rocks and wood to form your desired composition. Take time to adjust angles and distances, imagining how plants will grow around them. It is easier to make changes now than after filling the tank.
• 5. Planting
  Mist the substrate with water so it is damp but not flooded. Use aquascaping tweezers to plant stems and foreground plants. Attach epiphytes like Anubias and mosses to rocks or wood with thread or glue safe for aquariums.
• 6. Fill the aquarium
  Place a plate or plastic bag on the substrate and pour water onto it slowly to avoid disturbing the layout. Add water conditioner as directed and fill the tank to the desired level.
• 7. Install equipment
  Set up the filter, heater, and lighting according to manufacturer instructions. Check that the heater is fully submerged if required and that the filter intake is protected for shrimp-friendly setups.
• 8. Start cycling
  Turn on the filter and heater. Begin the biological cycle using your chosen method. Keep lights on a short schedule and monitor water parameters.
• 9. First inhabitants
  After cycling is complete, introduce the first animals gradually. Acclimate them carefully by floating the bag and slowly mixing tank water over 20–30 minutes, then gently net them into the aquarium.
• 10. Ongoing maintenance
  Establish a weekly routine of partial water changes, glass cleaning, and filter checks to keep your nano aquarium healthy and clear.

Throughout this process, MB Store can provide everything from aquarium kits and fine planting tools to high-quality conditioners and bacterial starters, helping you move smoothly from an empty glass box to a thriving underwater habitat.

Maintenance and Long-Term Stability

Once your nano aquarium is established and stocked, consistent maintenance becomes the key to long-term success. Because the water volume is small, regular care prevents problems from developing into serious issues.

Plan on performing a 25–40% water change every week. Use a siphon to remove debris from the substrate while draining water into a bucket. Replace with dechlorinated water that is roughly the same temperature as the tank to avoid stressing fish and shrimp. In heavily stocked or heavily fed tanks, you may need slightly larger or more frequent changes.

Clean algae from the glass using a magnetic scraper or soft pad. In planted aquariums, some algae are almost inevitable, especially in the first months. Rather than chasing complete elimination, aim for balance: adjust light duration, feeding, and fertiliser dosing if growth becomes excessive.

Filter maintenance should be gentle. Rinse sponges and filter media in removed tank water, not under the tap, so you do not kill beneficial bacteria. Never replace all media at once; stagger changes over several weeks if something needs to be renewed.

Regularly test basic water parameters—ammonia, nitrite, nitrate, and pH—especially in the first six months or after any change in stocking. Observing your fish and shrimp is equally important. Clamped fins, rapid breathing, or hiding behaviour often signal that something is wrong even before tests show it.

Feeding in nano aquariums requires restraint. Offer small portions that fish can eat within a minute or two, once or twice daily. For shrimp, supplement biofilm and algae with specialised shrimp foods or small pieces of blanched vegetables, but remove leftovers to keep the water clean.

With the right routine and quality tools from MB Store—such as siphons, algae scrapers, fertilisers, and test kits—keeping a nano aquarium clear and stable becomes a simple, enjoyable habit rather than a chore.

Common Mistakes to Avoid

Even with careful planning, beginners often encounter avoidable problems. Being aware of these pitfalls can save time, money, and frustration.

• Overstocking
  Adding too many fish, or species that grow too large, quickly overwhelms the biological capacity of a small tank. Research adult sizes and social needs before purchase.
• Skipping the cycle
  Introducing fish into an uncycled aquarium often leads to ammonia and nitrite spikes, causing stress, disease, or death. Commit to completing the cycle first.
• Inconsistent maintenance
  Irregular water changes and filter cleaning allow waste and algae to accumulate. A simple weekly routine is easier than emergency fixes.
• Overfeeding
  Extra food decomposes into ammonia and fuels algae. Feed sparingly and remove uneaten pellets or flakes after a few minutes.
• Inadequate equipment
  Tiny, weak filters and unreliable heaters may come with very cheap kits. Upgrading to quality devices from MB Store improves stability and protects your livestock.
• Impulsive livestock choices
  Choosing fish based solely on appearance without checking compatibility or tank size often leads to aggression or long-term stress.
• Ignoring evaporation and top-offs
  In small tanks, evaporation can significantly change water level and, in some cases, hardness. Top off with pure water to maintain stability between water changes.

By avoiding these common errors and leaning on solid information and reliable products, your nano aquarium can become a thriving, low‑stress piece of living art.

FAQ

How many fish can I keep in a 30L nano aquarium?
In a 30L tank, focus on a single school of small nano fish, such as 8–10 chili rasboras or ember tetras, plus a few shrimp or snails. The exact number depends on filtration, maintenance routine, and species. Light stocking is safer in small volumes, so resist the urge to mix many different types.

Do I really need a heater for a nano aquarium?
If you keep tropical fish or shrimp, a heater is strongly recommended. Room temperatures often fluctuate, especially at night or between seasons, and small tanks lose heat quickly. A stable 24–26°C is ideal for most common species. Only unheated, cool‑water setups with carefully chosen animals can safely go without a heater.

How long does it take to cycle a nano aquarium?
Cycling typically takes 2–6 weeks, depending on temperature, use of bacterial starters, and ammonia source. You know the tank is cycled when ammonia and nitrite consistently test at zero, even after adding a small amount of food or ammonia, and nitrate is present. Rushing this step often leads to livestock losses later.

Can I keep a betta fish in a nano tank under 50L?
Yes, a single betta can live comfortably in a well‑filtered, heated nano aquarium of around 20–40L. Avoid very small containers. Provide gentle flow, plenty of plants, and hiding spots. Tankmates must be chosen carefully; many bettas prefer to live alone, and fin‑nipping or bright tankmates can cause stress or aggression.

How often should I clean my nano aquarium?
Most nano tanks benefit from weekly maintenance: a 25–40% water change, light substrate vacuuming, and glass cleaning. Filter sponges can be rinsed in removed tank water every few weeks. Regular, small tasks keep the system stable and prevent the need for drastic interventions later, which can shock fish and plants.