They are invariably marketed as group fish, but take caution as the males will fight one another. Males can be kept singly or in pairs, but may be fine in a mixed community with other fish which are very peaceful, similar in size and with a less colorful look. A handy cheat sheet that will benefit amateur betta keepers, and could likely hold some surprises for more experienced keepers as well, can be seen in the Betta Fish Care Infographic. Aquarium Hardiness: Very HardyAquarist Experience Level: BeginnerFoods and FeedingAlthough the Siamese Fighting Fish are omnivores that will eat some green algae in nature, their diet is basically carnivorous. In the wild they feed totally on zooplankton, insect larvae, crustaceans, and aquatic bugs. In the aquarium they can generally eat all kinds of live, fresh, and dry protein foods.