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So I am in the process of cleaning my 250 gallon tank. The tank has coralline algae on the overflows and the back glass. I have removed most of the coralline on the back glass, but there still is some spots. I have tried fresh water with distilled viniger and don't think it will be strong enough. What are some other options I could use that are reef safe and will not harm the tank later on when I set it up?