Like a number of coals or shall we say weeds, GSP can quickly spread.
Getting rid of it is almost impossible. GSP is very hard to get rid of. I have seen patches of GSP in FOWLR tanks doing just fine.
I sometimes just turn the rock over so that the GSP is face down into the sand. The GSP however will be back within a month or two.
You can also move a rock into your sump if dark and leave it there for a few months and the GSP will slowly disappear.
Tom R
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