I used to have sand but then I fell for all of the hype over miracle mud and switched to it. I wished I hadnt. I dont see any benefits to it and a big negative is that it is easily disturbed.Every time that I harvest my macro, I get a big cloud of muddy water that overflows into my return area and gets pumped into my tank. In the near future I will be upgrading to a bigger tank and bigger sump/refugium and the mud will be getting tossed. I will be going back to sand or possibly crushed coral when I do upgrade. The reason for the crushed coral is because I just found a bag of it in all of my supplies. I didnt know I had it, so I might as well use it.