My own experience makes me skeptical of the statement that acropower is proven. I just went through 500ml of acro power, which was dosed automatically at 4ml/day in a 50gallon tank. I ran out about 2 months ago, and now am not using anymore. I thought it may have helped when I was using it (euphyllias showed more improvement during that time than acros), but now that I am not using it, the corals look better still. I probably will not be buying again. I never saw it stimulate polyp extension. Polyps are out more now, since I ran out.