Okay, I bought a bag of playsand from Home Depot and I put it in my bathtub in a bucket. I put the water on and let if overflow, but someone needed to use the tub and I got impatient so I took it out after about 5 minutes. Then I started draining water from the tank into an 18g tub that I have, and once I took out about 2/3 of the water, I caught most of the fish and put them in the tub. I couldn't catch all of the fish, because I'm not that skilled at fish catching. I also put a 200w heater (it was my only spare) and both HOB filters in the tub. I drained more water until the tub was full and then I started taking out the gravel, a scoop at a time. The water started to get pretty cloudy, so I finally caught the remaining fish and put them in the tub. I removes the UG filter and completed the switch to sand. Now, the tank is very very cloudy, and I can't see my hand 2 inches away from the front of the tank. I moved one filter over there, to help clear it up, but it's still very slow. The heater in the tub was making the water too hot, so I unplugged it, but now it'll get too clod again. The fish appear happy in the tub, they are acting normally, but I want to know when I should put them back into the tank. I have about 5 hours until I go to bed, and I don't think the tank will be clear by then.