Great thread, I'm so out of touch with skimmers and I learned a lot just from the 1.5 pages here. My old Etss skimmer has done well i guess, but I'm kind of getting tired of the large pump(noise) and constant fiddling. If anyone has a extra skimmer I can play and compare too I'd love to try something else. My reef is a heavily stocked 72 gal + 40 gal sump. What determines a better skimmer? If installed as a second, would it not skim if its inferior?