Brown Algae on Acrylic
Anyone know what is the brown algea type thing that is growing on the acrylic. It only grows on the front clear side, it appears in the tiny scratches first and then also in dots all over. I have to scrub fairly hard to remove it as the standard magnet scrubbers dont remove it. The growth does not get hairy like typical other algaes but is smooth and almost oily to the touch. Sand granules typically get into my scrubbing pads so I am really just making it worse everytime I scrub them off which is weekly. Acrylic scratches so easy I dont want to have to end up doing a huge repair in a year or two.. My salt aquarium is 75 gallons and has been up about 15 months or so.. any advice is appreciated.. tired of scrubbing and now my clown bites me and chases my hand around when I am cleaning.. those little guys can bite hard too..