I have a small 40 lt tank that has everything yes plants, glass, rocks. driftwood covered in small ( 1 to 2 mm ) white single stem what looks like sea anenomy..this is a fresh water tank...how do I get rid of them ? I am doing 25% water changes each day that is having some effect but have been told a car battery terminals in the water will get rid of this & not harm the fish ?? any comments that will help would be appriciated..