My 75g tank has a wicked moss outbreak, how do I fet rid of it? My pater perameters are spot on, ammonia 0, nitrite 0, nitrate >20ppm. And I do 20 % water changes weekly. My tap water is a fishkeepers dream too, no nitrates, nitrites or ammonia..... I do use api aquarium salt to the recommended dosage... Whats the deal? 
