I can't offer any comments about the PM skimmer, but I just tore down my Remora Pro. I was running it with a Mag5 pump and still wasn't satisfied with its performance. I replaced it with a Deltec MCE600. The improvement was noticeable immediately. I finally understand others comments about the Remora being noisy, inconsistant, and worst of all, a huge pump in the tank and only producing tea color skimmate. The Deltec pulled some ugly stinking stuff from my tank in less than 2 days. And I did a 30% water change before turning it on. It's quiet and only puts an intake and output tube in the tank. The Deltec pump sits inside the skimmer body "outside" of the tank. Yes it was expensive, but so are my fish and corals. I'm not trying to bash Aqua-C and I still have a standard Remora on a 29g. I'm sure there are cheaper and still efficient units out there. I'm just through guessing and experimenting for a good skimmer on my 54g. Good luck.