I have a red sea reefer 350 g2 tank (75-gallon display, 17-gallon sump) and I'm shopping for a red sea protein skimmer. My LFS has a sale on the Rsk 600 AC for $400 and the Rsk 300 DC at $415. I don't know what to get between these two because I heard that oversizing your protein skimmer is bad and the Rsk 600 is rated at heavy bioload at 130 gallons. I'm also planning on adding a refugium too. I will probably have a heavy bioload since I like having lots of fish and corals in my tank with maybe 1 yellow tang or a kole tang.