i have 2 filters in my tank...30 g fw...i have an aqua teck 20-40 and a biowheel 150...both filters are growing white striny things on the outtake of the filters..(where the water comes out) is this a bad thing or a good thing..also the biowhell is turing a brown color with brown blobs on it...is this the bioloical bacteria i dream about???please help..
peace
peace