Ok so the problem is I have a 210 gallon tank with 2 large oscars about 12 inches each along with 1 pleco. i have all sand for the tank with a fluval fx 5 Canister filter. the bottom of the tank keeps getting way to much junk at the bottom i feed my oscars a few pellets each twice a day one in the morne once at night i make sure they eat all the food so none goes to waste and their waste seems to get every where and my filters don't seem to clean the bottom is there any good way to make a current at the bottom of the tank so the wast from the fish dosent settle or a set up i can do with my fluval Fx 5??? please help