I have water balance issues but I vote take them out and clean them. Every nook and cranny in my tank has it. It grows easily, spreads easily, and it floats through the tank to other parts of the tank, the sump, and in the powerheads. I'm going to have to temporarily relocate the fish and remove the live rock and substrate to get it out. I already did that with the sump and put filter socks on the overflow to keep it out.