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Originally Posted by lorenz0
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i had it about an inche from a power head and that area of the colony looks like it is bleaching. here are a few pictures please help a fellow sps newbie out  ....
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So you had the acro an inch away directly in the powerheads flow? It looks like the tissue is damaged in the area and is sliming up a bit. If the acro was in direct flow you might want to move it away and let it recover. You want good chaotic flow where the polyps move back and forth.
You should also be testing for alkalinity.