Just want to agree with the others to be careful about over-cleaning your filter. You can un-cycle your tank that way. You should only clean it enough to keep it running smoothly. I've personally never used Bio-Wheels, but with my AquaClears I never ever replace the media. It's a moneymaking scheme for the filter makers. (When things get gunked up I do give the sponge a good rinsing, but why replace it? It isn't worn out just dirty!)
The only thing that really wears out are the carbon inserts...but you don't really need those anyway. All they do is improve water clarity which is really only useful if you put in driftwood with a lot of tannins and don't like brown water.