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Does this happens to ALL sps, or you god some survivers? I have no experiense with your lightning, but when sps don't get light acclimated and put under too heavy light too fast, it throws out its zooxanthellas, gets beached and starves to death. Too high levels of nutriants do the opposite and you get å dark green or brown coral. Copper (cu) is å killer too. There are a great number of things that could be the answer. These are just a few thoths.
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