BullDog wrote:My suggestion is that you DON'T get prefilter. The holes are too big for it to really filter anything out. I used it because I bought it before I knew better

I'm using my prefilter as bio media now... seems to work pretty much the same as biomax.
Luna - for a start, here's what you might want to try:
Bottom basket - BioMax or Bio Balls (this is your biological filtration)
Middle basket - Carbon and/or ammonia remover (this is your chemical filtration)
Top basket - Pre-filter, filter pad, or filter floss/fiber (aka "fluff") (this is your mechanical filtration)
See how that works out. If you are having problems with your water, post back here what media you are using and you can get some help with fine-tuning what should go in your filter.