for my 55 gallon i have a magnum 350 with bio-wheels and a AC 802 powerhead with the attachable filter. I was wondering since u cant use carbon with the micron filter, only if u use the right size sleeve thing, if instead i put the carbon in the contaner type thing in the power head filter if that would work fine? btw the magnum pumps 350 g/hr and the AC power pumps 400 g/hr