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I don't think it's as critical as with stony corals, but there is a limit. I noticed some of mine were not looking good at all. Finally tested and found alk was down to about 5.5. Not good. I have been slowly raising it and with it now at 6.5, most of them have perked up again. I will continue to slowly raise it to somewhere between 7 and 8 most likely.
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