ill review it myself since now i have some experience with it. Its a BEAST!! The skimmer fit perfectly in the skimmer chamber for the red sea max 250. I adjusted the air and cup position correctly and off she went skimming. This Deltec MC500 needed no break in period and starting creating thick foam instantly. This skimmer produces so much more skimmate then the original. Its not noisy at all and is worth the steep price tag they came with. Very happy...:fish: