The water in my 20 gallon is cloudy. It's a long story, but I took it down and set it back up yesterday, reusing all the water and sand, and the decorations. It was cloudy before I took it down. I'm running a well established Fluval 206 canister, and just added an Aqueon QuietFlow 10 HOB on Friday. There is no carbon in the Fluval, but there is in the Aqueon. I know I need to do a water change, but will that help the cloudiness? I have attached photos of the test strips. Looks like there is some ammonia in the water. As for fish, there are currently five red eye tetras, one black neon, two Chinese algae eaters, and a zebra (nerite?) snail. By comparison, my 65 is crystal clear.