After some bad luck with cardinal tetras (RIP), I'm getting interested in an all rainbowfish tank.
20g tall is currently a home to 8 celebes rainbowfish and some ottos.
The plan would be to add 10 dwarf neon rainbowfish next.
Then maybe a single turquiose rainbowfish as the centerpiece?
Smoke 'em if you got 'em.
20g Tall Low Tech Planted