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Best fish for a 80 litre tank

71 species on file have published minimum tank ≤ 80L (freshwater). 65 species need a larger minimum on file. This page filters — it does not replace the tank builder or pair checker.

An 80L is the first confident community size. Two schools work here, or one school plus a pair of dwarf cichlids. The bioload buffer is real, so a missed water change does not crash the tank the way it would in a 30L. Most published care-minimum tanks slot into this range comfortably.

Stocking philosophy

80L is two species playing nicely, not three. The temptation is always to add the third, and the third is what overloads the filter.

80L mistakeBuying the fish at the length you see in the shop, not the adult length on its profile. The shop length is six months old at most.

Open tank builder (80L)·Pair checker·All fish

Good first pass (conservative community rules)

Beginner/intermediate peaceful, not predatory, not a small-tank fin-nipper below 80L — adult size capped for very small hubs. Still read each profile.

Beginner-peaceful picks (subset)

Care beginner, peaceful, not fin-nipper, not predatory — same filter as before, stricter care label.

Caution (suitable by min tank, not a free “community” pass)

Fin nippers, semi-aggressive, advanced care, large groups, or may-eat-small-fish on file — may work in a mature, species-appropriate setup.

Specialist / high-load (even if min ≤ 80L)

Predatory, aggressive, advanced, large group needs, or may-eat-small — not typical community-first stocking.

Avoid at 80L (need larger min tank on file)

Adult bristlenose plecos work, common plecos do not. Pearl gouramis and Bolivian rams overlap, but discus, angels at adult size, and clown loaches still need more length. Schooling barbs need 100L+ to spread the nipping inside the group rather than at tank mates.

Published minimum volume greater than 80L — do not plan these for this class of aquarium.

Example sketches (illustration only)

Not a stocking guarantee — every mix needs the builder and pair checks.

  • Beginner community sketch

    Example mix to research: Amano Shrimp with Beckford Pencilfish, Black Neon Tetra, Black phantom tetra. Each pairing still needs the pair checker. The substrate and heater matter more than people give them credit for, so pick those once and well. Run it through the tank builder before you buy. The size and colour of fish in a shop tank are not stocking proof.

Common mistakes at this volume

  • Buying the fish at the length you see in the shop, not the adult length on its profile. The shop length is six months old at most.
  • Under-schooling tetras, rasboras, or barbs. The fish look sick during the first week, and the diagnosis is almost always group size, not disease.
  • Mixing fin-nippers with slow or long-finned fish without checking the fin-nipper flags. Most personality clashes you read about online are layout problems with a named scapegoat.

Suitable for this volume (full list, 71)

All freshwater species on file with min tank ≤ 80L.

Guides (same data model)

Other tank hubs

Categories in the suitable list