I just have a question about this type of algae. Now I don't have a freshwater tank but a friend of mine does and he mentioned that after adding real plants to his tank that he started getting this black algae. I realize that saltwater and freshwater are different and I mentioned that I used phosban to rid my tank of algae. Now I am not even sure if you can use that in a freshwater tank, and wouldn't he need some phosphates for the live plants? Any suggestions that I could pass along to him would be greatly appreciated.