so my neighbor is on vacation for 2 weeks and she brought her fish to my house for me to take care of. I don't know anything about fish. She has a decent sized gold fish and then a sliver and gold fish (smaller then the gold fish) and she has one of those black fish that suction to the side of the tank. She took about half the water out of the tank to transfer the fish to my house- when she re-filled the tank it was cloudy at first but cleared up throughout the day. The fish have been here for 5 days and now yesterday the tank started looking cloudy and today - it's very cloudy. She instructed me to feed the fish a small pinch of flake food twice a day- so that's what I do. The tank is infront of a window on my desk- could the daylight be the problem? I really don't want her fish dying on my watch. The fish are still active and seem fine but I'm just worried. Anything I could have possibly done to cause the cloudy water? Anything I should do to fix it?