Mine goes with the flow from the diplay in to a section with my skimmer. Then have baffles into the fuge. I have live rubble and a three inch sand bed. The water then flow into a return section that goes back to the tank. I feel that by skiimming in the first section the fuge does not get all the stuff it may need. I may be wrong. Secondly alot of the crap does not get through the baffles and builds up. Is my set up wrong?