yup i had the same question as OP before and chose red sea coral pro too. i'm doing a water change tomorrow. if you like i can post my coral response and test my water. will be doing a 25g WC on a 180 system.
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Reef crystals has too much ca and alk if you ask me. I prefer regular instant ocean in case I need to lower ca or alk, I could always dose to raise it.As subielover said, there isnt a best salt.
But I do stand by Reef Crystals out of all of them... I want to try Brightwell, I hear its nice, but can cause Cyano problems.