I have a piece of that same stuff. The polyps extend to about 1/2 an inch. I have had it several months now seems to be doing good. I have found that it likes medium light and flow. It tends to go pale in brighter light.
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72 gal bowfromt mixed reef sps dominated, 25 gal mineral mud type sump/refugium Skimmerless
2x250 14000k phoenix hqi 2x96 pc actinic, 50x flow
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