I have a 55 gallon tank, upgraded from a 20 gallon 4 weeks ago. 7 white skirt tetras, 4 albino corys, 1 pleco, 1 guppy moved over from the 20 gallon. The old bio filter media went into the new filter, a cascade 300. The old gravel, plants(anacharis, java/flame moss) and driftwood moved over...