Just some thoughts.
-I hate sand! I would take it out.
-maybe a test kit is off?
-do you have SPS in a frag system (not in main display) but still using same water? (My dwarf angels, at least I think it is them, are nibbling more and more on my SPS in the main display, but as soon as I put a piece in my basement sump/frag system it starts to grow.
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