Guys this is the skimmer that I am currently running on my 155 bow. It is doing fine so far. I had planned to upgrade, but have decided not to as long as my parameters are doing as well as they are I see no need to go out and spend $500+. You've seen the pics. I believe the problem was the fuge & tap water. Fuge & tap water are gone, and so is all the algea problems. Ammo 0, Nitrites 0, Nitrates .5, Phosphate .25, so as you can see this skimmer is doing it's job. I run mine with an Oceanrunner PH2500 pump. I use to use it as a hang on, now it is in the sump.