ok i have a 55 bow tank with a rena xp2 canister 40+- live rock 30lb sand and have been buying stuff for a 110 build and im new to the game here anyway i bought a bunch of stuff from someone getting out of saltwater and i got a aquarium systems hob skimmer that uses the maxijet powerhead to drive it i have never used a skimmer before so i hooked it up to the 55 to see what all it did if it was worth leaving it on there or not anyway it has been on there for about a week and there is nothing in the collection cup am i doing something wrong or does it take longer looking for sugestions and comments thanks, mark