aznflyfisherma, do you have a protein skimmer? I notice my tanks get a build up of a little froth on the water surface which I assume due to my lack of a skimmer. When it unsightly that's when I do a big WC. I first use paper towels to remove the froth then do a WC. I do this about every 3 weeks for my 20 long. Also, I'm surprised you're GSP hasn't taken over your tank! I have a 5 gallon Pico reef tank that I glued a bit of GSP on the back wall thinking it would be cool looking. But yikes that wall is totally covered and I have to trim it every month or so to remove new growth on the side walls!
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