Good setups for a 50 litre tank

Community setup

In 50 litres you can run a light community: one small school plus a few bottom dwellers. Six ember tetras or chili rasboras, four to six pygmy corydoras, and optionally a honey gourami as a gentle centrepiece. Keep bioload modest; this size swings quickly if you overfeed or skip water changes. Track parameters with a tool like App-aquatic so you spot issues early.

Centerpiece setup

One show fish plus a supporting cast works well. A single betta with six small rasboras (e.g. chili or harlequin) and a handful of pygmy corys. Or a dwarf gourami with six neon tetras and four corys. The centrepiece gets the attention; the school adds movement. Avoid large or nippy species — see betta tank mates if mixing with a betta.

Nano-only option

Shrimp and snails, or a tiny school of celestial pearl danios or ember tetras with no other fish. Low bioload, minimal fuss. Good for beginners or a desk tank.

What to avoid

Cichlids need more space; 50L is too small for African or South American cichlids. Goldfish, large livebearers, and anything that grows beyond a couple of inches will outgrow or overload this volume.

Quick takeaways

• 50 litres suits a small community, a centrepiece plus school, or a nano-only setup.
• Stick to small schooling fish and pygmy corys; leave bioload headroom.
• Cycle first, add gradually, and keep up maintenance.