My new Fungia is starting to bleach around the outside, and in the center. The guy had said to have it pretty low in the tank, so i had it 6" from the bottom, but now ive moved it to the sand to try and save it. My dad also keeps messing around with the valves to try and get everything stable in the tank, but then the water in the return gets low, so the auto top off is constantly adding a gallon or 2 of RO so the salt is constantly changeing. Yesterday it was at 1.025, and today its at 1.021 (on a refractometer) Anyone think this might be why the Fungia is bleaching?