I do see the rock leaching. As I read about Marco rock which is what I choose to use. I kept rock in holding tank and did water changes from the water in display tank. Also used prodibio. After two months I used it to set up new tank and tested today no po4
Down fall is the lack of biological on rock and I am seeing the coral react to the Marco. It'll take time but in long run I'm sure ill be happy with the Marco
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