Can Siamese fighting fish Live With Pygmy corydoras?

Pygmy corydoras are a poor fit for most communities. They are very peaceful but easily intimidated by larger tankmates and poor competitors for food, and they do best alone or with other tiny species such as similarly sized characins, cyprinids or small shrimp. At about 3 cm, a pygmy cory is less than half the length of a betta.

Unusually for a cory, it often hovers in the middle of the water column, which is where a betta spends its time. That removes the separation you get with bottom-dwelling cories. It lives in groups in nature and will school happily with other small fish.

The water overlaps at 22 to 26 °C and pH 6.4 to 7.4. If you still want to try, keep at least six pygmies and preferably ten or more, on sand, feed fine foods where they can reach them, and check that they are getting their share. The betta itself is best kept alone in most cases.