limiting nutrients threw some form of nutrient export(ex. water changes, protein skimming, carbon dosing) will rid you of your problem. but if you are looking to rid the tank by chemical means. you can also used maracyn (erythomycin (active ingredient in red slime remover)) intended fresh water, at a dosage of 200 mg/50 gal. this will only be a temporary fix until the nutrient levels are lowered**CAUTION** DO NOT USE maracyn intended for salt water. salt water maracyn contains other chemicals. fresh water maracyn contains just e.m.