I have it on my back glass (front and side if I didn't scrape it off), on my LR, on my CC, on my power heads, on my clams, on my return pipes, on the cords going to my power heads, on my snails, on my crabs, in my eco-systems, on my macro-algae in my eco-systems. I think I found some in my underwear last week. kH 10, Ca 450, lights on 12 hours a day. 6 110w vho in my 120 and 90 gallon and 4 110w vho in my 75 gallon.