We just noticed that we have several small patches of what appears to be black hair algae. What can I use to treat this. My nitrates are 20 to 25 ppm, phosphates .045. The rocks are mostly glued together so they can not be removed from the tank to treat individually so what ever i do will have to be done inside of the tank. It is 125 gallons and about 1 year old with several soft ,zoas and LPS corals. I do have some , probably 5 to 10, hermit crabs .
