I bought it, and used it around 1.5 yrs ago, and can say it didn't help. Let me explain. At one time I had a thriving reef. Mostly Softies, and LPS, with a few SPS (Monitpora cap and digitali, slimmer..). Then I noticed the great decline. Something wasn't right, but couldn't put my finger on it. I spent honestly a year trying to figure it out. Bought some new live rock to re-seed my system, upgraded my skimmer, had DSB both in the DT, and refugium, and two types of micro algae. Then tried miracle mud. Nothing changed after several months. I did a post here, and everyone asked my parameters, after providing, I was asked about NO3 and PO4. I thought, hey, I'm not new - had a reef for 3+ yrs at the time, we don't check NO3 and PO4 anymore. Wrong. When I checked them both, NO3 was between 50 and 100ppm (Salifert) and PO4 was .25... Once I attacked that, boy did things change. Within weeks, all my coral exploded with new growth, and everything was back to 'normal'. Before you go buy it, recommend making sure everything else is in order. I later had to replace my fuge due to a leak, and now don't have a DSB in it, or Miracle Mud