Refugium Question !?!


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i have 2 inches of it under my gravel that is 1/2 inch thick 1 year old have nothing good or bad to say about it .i have many tanks and only one with mud i have heard that it adds minerals but also heard that with proper water changes its not very much af an addition ,so some one else may be able to tell you the real stats but i have seen no vast difference . i have frags of the same coral in many different tanks and they all seem to be about the same as far as polip extention and size . take it 4 what its worth the stuff is pretty expensive ,i use REEF CRYSTALS salt mix and theres enough trace elements in it GOOD LUCK !