I too tried a lot of different salt, and did not have a good experience with zoanthids and H2O because my zoanthids stopped growing and many shriveled as well. I returned to IO but using Reef crystal and my zoanthids grew large and healthy again and now are starting to reproduce. 25$ less for a bucket, so it's a no brainer. I still had to dose with H2O anyway, so that did not change at all. I am very happy with Reef Crystal and the way my zoanthids are growing and gaining in size again.
I have never seen that Nature salt sold here in Montreal.
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