I have this green film on the sand. It will blow off in chunky sheets with a turkey Baster. I try storing it up and siphoning what I can. I am running BRS GFO and carbon. My salifert kits tell me PO4 NO3 are both zero. This is a 40 breeder with 2clowns and a tail spot blenny. I tried using Algaefix about a month ago because I was fed up. It did nothing. I have also tried chemiclean thinking it was a green bacteria. Didn't change. Any tips??

