i am wanting to make me a bait tank to keep any bream or minnows i get alive. i saw a filtration unit at walmart that is used in the gold fish ponds that people put in their yards. it circulates the water through it and it said on the package that it filters out any ammonia plus a few other things that i cant recall right now. my question is being that it circulates the water through it would i still need an aerator? second question is what can i use to feed the baitfish to keep them from dying? could i just give them some goldfish food or something? any help is greatly appreciated.