http://forum.aqua-fish.net/ A forum devoted to aquarium fish, plants, techniques and fish keeping as a whole. en http://forum.aqua-fish.net/?topic=cloudy-tank-#1 Ok so, my fish tank has been up and running since June. Recently,about a week ago I did my routine quarter of the tank water change. Nothing out of the ordinary, I've been doing it once a week since I've gotten the tank. However this time around my tank turned very cloudy after a few days. Nothing has changed in the tank, only one new fish totalling 6 in a 20 gallon. I've added bacteria supplement and a water clarifier but nothing has worked. I'm afraid to do another water change that might make it worse. Any ideas how to fix this? jkb475 2010-10-08 http://forum.aqua-fish.net/?topic=cloudy-tank-#2 Have you cleaned your filters recently and if so did you use old tank water rather than clean mains water? mickey 2010-10-11 http://forum.aqua-fish.net/?topic=cloudy-tank-#3 I clean them every other water change, I use a bucket full of treated water. jkb475 2010-10-11 http://forum.aqua-fish.net/?topic=cloudy-tank-#4 by treated water I take it you mean fresh water with conditioner in. This is wiping out you rbacterial colonies, filter pads should only be cleaned in old tank water mickey 2010-10-11