I prefer becket injector skimming= most powerful skimming with tiny bubbles. Can use any pump. Can place anywhere=in sump out of sump anywhere. easy to clean. Etss has powerful skimming but bubble aren't nearly as small and can be harder to tune. Becket is plug and play. Becket= HSA, bullet,aerofoamer ,MYREEF skimmers. I second Euroreef skimmers. But most any top skimmer is good= Lifereefs venturi ect...