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Small Fish Tanks

Small fish tanks and nano aquariums are perfect when space is tight, whether that's a desk, a bedroom shelf or a kitchen worktop. Choose from compact freshwater kits for a single Betta, shrimp or a small group of tetras, through to all-in-one nano reef tanks for corals and clownfish. We stock small tanks from Fluval, Aquael, Ciano, biOrb, UNS, Red Sea and more.

Browse just freshwater nano aquariums or marine nano tanks, or read our guides to the best freshwater fish that stay small and the best size aquarium for a beginner.

 Have questions about Small Fish Tanks? Checkout our FAQ!

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Small Fish Tank FAQs

We have answers. Get quick help for common questions.

1. What counts as a small fish tank?
Usually anything up to about 60 litres. Nano tanks are often 10 to 40 litres and fit on a desk, worktop or shelf.
3. Are small tanks harder to look after?
A smaller volume of water changes faster, so temperature and water quality can swing more quickly. Light stocking, careful feeding and small, regular water changes keep a nano tank stable.
5. Can I keep a reef in a small tank?
Yes. All-in-one nano reef kits from brands such as Red Sea, Fluval and UNS are built for small marine setups. They need stable salinity and regular testing, so they suit keepers ready for a little more care.
2. What fish can I keep in a small tank?
Choose small, peaceful species such as a single Betta, small tetras, rasboras, endlers or dwarf shrimp. Avoid fish that grow large or need lots of swimming space, such as goldfish and most cichlids.
4. Does a small fish tank need a filter and heater?
Every tank needs a filter, and tropical fish also need a heater. Many of our kits include a filter and lighting, so check each listing to see what's in the box before you buy.
6. Where should I put a small fish tank?
On a level, sturdy surface away from direct sunlight, radiators and draughts. Even a small tank is heavy once filled, so make sure the furniture can take the weight.

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