I have always had gravel substrate in my aquariums. I am trying Super Naturals Black Tahitian Moon Sand for a new aquarium, an dI can't seem to make much progress on cleaning the sand. First, as soon as I put the gravel vacuum in the water the fish freak out and kick up the poop. I just spent about 15 minutes vacuuming my 46 gallon and took out half the water. It still looks like crap!! And, the water is really cloudy from the sand. Do I need to turn off my filter too? For how long?