I bought these white button polyps and they turned abit brownish. Some are still white and any new growths are white. Has anyone every experienced this? All other corals in tank are healthy.This is the only one. Water changes are done every two weeks. Phosphates are 0ppm as are all others etc. nitrate..... Water changes are done with rodi unit.Someone has told me it might need iodine but I haven't put any in because I want to see if anyone on MR can help
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