Won't cause stripping due to the product but if you over use any PO4 removing media to the point that you strip out PO4 rapidly then sensitive SPS are usually the first to suffer.
Use the stated amount and use as slow a flow as possible so not to shock the corals.
in that case: gha, no way. stn/rtn, maybe like the other poster said if it is used incorrectly. i use it and have no gha and one of my sps is stn but i think it is shipping stress..
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