Her's my experience with the product. Started 2&1/2 weeks ago running these. First 10-12 days had clumping, slime build up and bad bacteria bloom. Corals weren't looking good, my hawkfish was not doing well and my prized sailfin was in bad shape. All this happened while I was offshore and wife didn't know any better, ( I should have left her some instructions on what to do about this while I was gone she handles everything). When I came in I was real close to pulling the plug on these like I did with two other brands I tried. I put some carbon in about 5 days ago, cleaned out my reactor and re-started, went back offshore. Came back in last night and low and behold all my corals were looking good, my hawkfish was back to normal but I lost the sailfin. My nitrates before were running about 60-80ppm and my phosphates were at .5ppm. Checked this morning and my nitrates were at 20ppm and phosphates are at .0-.25 (hard to tell with the test kit). Bacteria bloom is clearing up and my overflow tubes are not as dirty as they were. The only problem if it is one is I had to run some warm r/o water down my skimmer air tube because it wasn't skimming good. Since I did this it picked up again. Figure it might have still had some slime on the pinwheel. Pellets are tumbling in a real good fluid motion. All in all I would have to say other than a couple of issures that I am happy with the results I have seen so far.