Demo
River Keep demo · Nano, 5–10 gal · calm, like a pond or swamp · running 434 days · shared October 2026
Still water, lots of plants, and tank mates too small and peaceful to bother a betta's fins.
Betta (Siamese fighting fish)≈Betta splendens
Rice paddies and marshes of Thailand
× 1
Builds a bubble nest under the floating plants.
Rio Araguaia basin, Brazil
× 8
Rio Madeira basin, Brazil
× 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.
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.
