After my skimmer broke i decided to go with an ATS. My hair algae is out of control and the ATS doesn't seem to be helping. My ATS is 12 X 12 double sided with 26watt CFs on each side. It is in my sump an all of my water runs through it, my return pump is around 800. oh yeah and my tank is 125 with a small bioload. I have had the ats running since April i clean green algae off one side every week. I have also siphoned out algae, pulled it out and it just isnt getting any better. I am about to give up and go back to a skimmer. Any suggestions anyone has would be great.