Hi George. As you know I have been trying the quickphos for a while now and I must say it is great stuff, being Al based I was a bit worried as I know some other manufactures one causes problems with some softies. I must report no adverse effects with softies at all, and in my SPS tank it went from a reading of 0.5 to 0.01 over night so if definitely does work. My real question is what happens if you forget to take it out or leave it in? I have maintained a reading of 0.01 for sometime now so have not removed it, this has been for a couple of weeks now. Do I just leave it in till I get a higher reading.