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Are you keeping corals or just fish? People have many opinions on this. I've had success with reef crystals by instant ocean. But I have lots if corals.
I like Kents reef crystals but was told it will make your magnesium go thru the roof so I just use plain instant ocean my growth isn't a fast but everything in this hobby revolves around patience
Reef crystals, I monitor all the time and over many years I have found it works fine. I have never seem a magnesium spike, in fact I end up supplimenting magnesium, but I have a very large coral load.