you people are crazy you are always on here doging people out about tanks sizes i worked for the humane society and its people like you who get on these boards running you mouths trying to be know it alls why the hs is working with other groups to stop the import of pet fish period if you have such a problem with pacus talk to the people who import them i never see you guys bashing jeff rapps for selling fish that get 6-10 feet long if your not going to answer the question shut up and worry about your own fish. really all of your tanks are to small because none of the waters these fish come from can fit in your house so if you love fish that much send your back to the wild and stop catching breeding ad keeping wild animals in cages and tanks period. but let me guess your probably the kind of people that put a coat on a husky so he wont get cold.