Flame Tetras are known for their calm disposition, except of course, when they are attempting to consume their own offspring eggs.
But they are peaceful with their own species, preferring to travel in schools of at least 6, and get along with other species of similar size and temperament.
Flame Tetras are easily stressed, so it’s best to keep them away from active swimmers and fast-moving currents. And because they are easily agitated, they like to have places to hide when they feel threatened or just need some time away. They will look for caves and driftwood that will offer them some respite from the chaos of daily tank life.
They do love swimming, so give them ample space to swim around the tank. They will entertain you with their swimming through the thick leaves of the lush plants you provide them.