Hi I just bought 6 exodons for my 10 gallon. I have a few questions since I have seen threads that say that they like being cramped. How many could keep in my 10 gallon using a AC50 and a tetra pf10. Can thay eat minnows. Can I keep an electric catfish with them. are htere any small predatory catfish that will go with them. Also I paid $7 for these is this a good deal.