Lol it's called let it grow in the sump. I wish I was a master at controlling it. I just got over a battle in the tank with Haiti algae. First I had it all over the rocks, then it traveled to the sump and no more in the tank, tried to get rid of it in the sump and it came back in the tank. So this time it's gone in the tank and it's a little bit in the sump so I'm going to let it be until I hook up my kessil for my refuge. Once I do I will slowly (1 week at a time) remove small spots of the hair algae.You appear to be a master of algae control. Looks great.