Since I've been having an issue with gha and my skimmer here's what I did to attempt to fix it. First I noticed alot of detrius in my sump so I gave it a good cleaning today. I soaked my skimmer in vinegar and water for a couple hours. Now it pulls everything. I cleaned the gha off the powerheads. I'm going to clean them better this weekend. Also going to take a razor blade to the back glass and the overflow. Not sure what I can do about the rocks. I tried pulling it off but didn't work very well. I may cut the acros off and and put the rocks in a dark tub for a week or 2 to kill off the gha. Any suggestions?