Arthur
Member
Im not sure what is it. First pick was made couple months ago. It was bigger then now. I started removing it manually and it was almost all gone. Then now I noticed that 4,5 rocks have that growing on them. One is almost all covered. It doesn't bother me that much. I'm just afraid it can take over my tank. Do you guys know what that can be? Should I worry? Remove it as much as I can or just leave it. Thanks for all help in advance.