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Old 12-19-2013, 11:25 PM   #11
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It can't hurt. If more polyps close up you after a few days you'll know you went the wrong way.
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Old 12-23-2013, 08:16 PM   #12
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Barely budged the lighting, but did a 25% water change yesterday. Here they are today... Definitely more open.

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Here is my theory: I had a FOWLR for months and used the Instant Ocean mix. I'm guessing that the elements were not as concentrated as the tank these frags came from. Possibly, coincidently they began to close the same day as my initial water change that I noticed them closing. I'm using Red Sea Coral pro since I added corals... Could this be the case? I never tested alkalinity or calcium.
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Old 12-26-2013, 02:33 PM   #13
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So calcium is at 375, and alk is at 9.5. Would the low calcium cause the closing up?
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Old 12-26-2013, 03:07 PM   #14
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Zoas and palys not opening fully...

Probably not. It can slow down Stoney coral growth, but I doubt it could cause polyp retraction. My system runs best with a alk of about 9, so you're close there as well. Keep up using the higher quality salt mix and see what happens.

High nitrate and/or phosphate levels will close up polyps.
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Old 12-26-2013, 03:08 PM   #15
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Ok will do thanks
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