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I used purple up and it seemed to work beautiful. I didn't use it in a way to boost or maintain calcium levels tho like you are talking about doing. I maintain those by kalk and two part but just added a few capfulls every other dayish. it seemed to make the coraline grow much faster on the new base rock I had placed in the tank. I believe what they are trying to accomplish with the fine aragonite is so that the calcium in the mix will sink with the aragonite onto the rock work so it is more readily available to the coraline to use as well as most people don't dose iodine and just bank on doing water changes to replenish it but this product will add it to your system, I believe that iodine is needed for the coraline to grow as well.
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