I have this weird thing happening everytime I clean my turtle's tank. 2 days ago I cleaned his tank completely, fresh water that is dechlorinated, and I even wash the objects in the tank. I don't use soap, just hot water. The first day the water is crystal clear, the second day it gets cloudy and there is a sudsy foam on the surface of the water against the walls of the tank. Has anyone experienced this before? And can that harm the turtle? I know it's not soap but it looks like it. At first I thought it was the food I've been feeding him. I feed him turtle sticks, turtle pellets, feeder fish, earth worms, wax worms, greens, and dried shrimp as a treat. Are any of these foods known to cause suds in the water? Maybe it could be from him defecating?