I tried gluing GSP to the back glass several times but it fell off every time after a few days. I think it helps if you have some coraline on the glass first. Gave up on the GSP in my case, didn't stick even with grungy glass, but I have some fast spreading brown zoas or palys that have started a colony on the back glass. They simply spread there on their own from the rock work close by with no human intervention a-tall.
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