Just a thought ,,, I am not sure this means much to others ,, it does to me though I wouldn't want a skimmer that does to good of a job in my mostly SPS tank ,, between the filter socks ,, Bi Weekly water changes ,, the Reef Octopus Skimmer,,, direct feeding the few LPS corals in the tank, 5 Bower's once a week or so ,, my PO4 is staying around 0.03 in the tank ,, I couldn't tell you the last time I ran GFO on the system ,, seems like I have found a balance for PO4 in the system if I could just come up with a way to increase SPS growth