First off.. would a 75 gallon Hex be Okay for one of them? And form the small ammount of research i have done in the last 5 minutes it says they are freshwater.. is this true or is it really a brackish water fish? Also, what would it eat? I mean I would buy crayfish and ghost shrimp every few days for it.. but what about inbetween? would I have to set up a worm farm?