5 Fish That ACTUALLY Thrive in Small Tanks (40L / 10 Gallon Guide)

Choosing fish for a small aquarium can be confusing — especially with so much conflicting advice online. In this video from DALUA Fishroom, we get a clear, realistic breakdown of five fish species that genuinely thrive long‑term in a 40L tank. No overcrowding, no “they’ll need a bigger tank later,” and no misleading recommendations.

This guide is perfect if you're setting up your first nano tank, building a planted aquarium, or simply want fish that stay healthy and happy in smaller volumes.