Care sheets for fish that stay small
Every species here fits a 5- to 20-gallon tank. Each sheet gives the parameters that matter, the group size that changes behaviour, and the one mistake the fish does not forgive.
Chili rasbora
A 2 cm blackwater fish from Borneo. Soft, acidic water matters more than tank size — and it is the reason many chilis fade in hard tap water.
Care sheet → Trichogaster chunaHoney gourami
A peaceful labyrinth fish that suits a planted 10-gallon. Slow water, floating cover, and one per tank — the rest is easy.
Care sheet → Corydoras pygmaeusPygmy corydoras
A 2.5 cm schooling cory that actually works in a 10-gallon — if the substrate is sand and the group is big enough.
Care sheet → Otocinclus vittatusOtocinclus
The best algae eater for a small planted tank — and the fish most often lost in the first month, because a new tank has no biofilm to eat.
Care sheet → Hyphessobrycon amandaeEmber tetra
Under 2 cm, orange, tolerant of a wide temperature range, and happy in a planted 10-gallon. The best first school for a nano tank.
Care sheet →Log the parameters, keep the fish
Each care sheet lists the temperature, pH and hardness the species needs. Add those ranges to a tank in the app and out-of-range readings show up on the Today screen instead of in a loss.
Open the App Store link →