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With the mag, cal, and all all elevated like that, I'd put my money on the salt. Probably wasn't mixed up well in the bucket. Or it's just plain high. Coral pro is pretty elevated to begin with.
Also what is your Alk at.
Adding rock would not bring up calcium and magnesium I think it was just a coincidence. The Ich was possibly kicked off by whatever stress the fish may have gone through during the rock adding time
If your up for the drive The hidden reef had a 220 about a week ago. If they still have it you could always go in a check it out. I'm willing to bet Trop has one too
I went to the store with every intention to get the 220. Got there and reached in and realized I was well past my shoulder. Opted for the 180 instead.
That's about all I can offer