Demo
Save the Little Fish demo · Nano, 5–10 gal · calm, like a pond or swamp · running 440 days · shared October 2026
Still water, lots of plants, and tank mates too small and peaceful to bother a betta's fins.
Betta splendens
Rice paddies and marshes of Thailand · swamp or paddy
Lone male. Males fight. Keep one, or give each his own space.
Long fins. Fin nippers will pick on it.
Photo: ErgoSum88, Public domain
× 1
Builds a bubble nest under the floating plants.
Hyphessobrycon amandae
Rio Araguaia basin, Brazil · river
Photo: Cedricguppy - Loury Cédric, CC BY-SA 4.0
× 8
Corydoras pygmaeus
Rio Madeira basin, Brazil · river
Photo: AquaTuer, CC BY-SA 4.0
× 8
Every species is comfortable in this range.
No two species here can cross, so any fry that turn up are pure.
A rough estimate based on adult body size and tank volume.
Something at the top, in mid-water and on the bottom, so the whole tank looks alive.
Size and stocking checks use a typical tank of the size you picked. Add the real length and volume for a sharper answer.
Care data for Betta (Siamese fighting fish), Ember tetra, Pygmy corydoras is estimated or taken from the genus, not yet checked against a source.
