I drained my tank of all the water and removed all of the gravel. I spent about 30 minutes rinsing out the pool filter sand. The water was running clear so I decided it was okay to add it to the tank. WRONG! I filled up the tank and it looks like I changed the water with milk. It is so cloudy! I have already done two full water changes but the water isn't clearing up. I have my fish inside little Tupperware bowls but they have already been in those for over an hour now. Will cloudy water kill them? I want to get them back into my tank asap!