sfsuphysics said:I agree... with it depends what you want to do.
IMO you can have both, plumb it into your main system with some valves such that you can grow frags out in there if you want to sell/trade, then if you get new frags you want to QT you can turn a valve and keep the water separate (I don't think you need a sump for a frag tank myself... simply keep the water topped off and you're fine)