Had to change my substrate over the weekend. My wife tells me she doesn't like the larger grain sand I had in the tank... It looks like kitty litter.... lol.. take it out or move the tank out of the livingroom... It was an okay substrate, but the finer sand looks a lot better. Took most of the afternoon to do this... lol. Everyone seems to be doing fine today. All corals look great and the fish too... tested the parameters and all are right on. Of course the rock work is not the same now... it looks ok I guess. Never happy with the rocks.