I have a whisper 15 I believe on 2 of my 10 gallon tanks. I was wondering if I could use the aquaclear media packs (the sponges, and ceramic tube things) along with some filter floss in my filter instead of the cartridges... I'd like to just take out the cartridges and stack some media in the filter's compartments... would that be ok, or is there something wrong with this?