What I am suggesting is a hang on the back filter to add to the tank along with the sponge filter that sits inside the tank? These are two different type filters. I could not see what type of filter you are referring to.If you are adding fertilizers of some type to the tank the carbon would not be wanted for it will remove the fertilizer (liquid type). Carbon will clear the yellow water however. You could remove the carbon after it has cleared the water. Shouldn't take more than a day. doubt that java fern or moss would suffer in that length of time. Problem will re-appear until you reduce the numbers of fish.
The most important medication in your fish medicine cabinet is.. Clean water.
Last edited by 1077; 06-03-2009 at 08:40 AM.