Re: Green Water in El Natural what are the leading causes of green water. when i set up my 20 g. npt. the water was sort of a greenish, brackish color the minute i finished filling the tank with tap water. this is kind of fast for greenwater infestation isn't it? if not what else could it be. and more importantly how do i clear the water. there are several live plants plus a bunch of corie catfishes in the tank |