I have the MCE 600 on my 50 gal., it is an awesome skimmer, my only issue at this point is that I have micro bubbles, but what I am being told, this is part of the break in period. But the skimmer pulls some nasty nog, and it runs very quite. It not having a surface skimmer is a drawback, but if you keep enough surface aggitation it's not an issue. The other plus is it has a compartment for carbon or other media if you need it. I would highly recommend this skimmer.