If you are talking about erythrinus erythrinus they are not thet hard to keep they are extremly agessive and wil kill fish larger then them self. I fed mine frozen mussel most of the time, o and they are great escape artists so put some heavy stuf on the lid
Not as aggressive as you think. I kept mine with fish a fraction of its size. Mine was 6 inches when I sold it and was kept with a 3 convict, albino frog, small cuban cichlid, and a small gar. Never had a problem. He ate pretty much any food I tossed in the tank. His favorite was krill.
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Hahaha then you are verry lucky mine killd half my grow out tank inc a arowana clown knife and tsn-cat but i did keep him with danios, tetra and smal tiger barbs and he left those alone. So i guese any thing is posible