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Octopus skimmers seem to be the hot ticket these days. Great reviews, reasonable prices and big selection.
I agree with chrisd on the capacity rating. It seems a general rule that skimmer manufacturers over rate the capacity of the units. Get as big a skimmer as you can fit. As for GPH of the skimmer, a rule of thumb has evolved over the last few years to process the same amount (roughly) as is going through you sump. So, if your returning 400 GPH from the sump then get a skimmer that will do about the same or a bit more. This goes to efficiency. No sense in returning un skimmed water to the tank. Of course to make this a good working rule of thumb, you want to be sure the lay out and function of the sump allows the skimer to take advantage of these number corelations. But thats another subject!!!!
My current skimmer is a modded MR-2 with two injectors and a 12" addition to the riser. It does great but I am restless with the same thing after several years and will be going to a needlwheel type skimmer and am considering rather large Octopus recircualting skimmer. What I will get will be fed purely by the overflow and this will allow every drop of water from the tank to be skimmed and then an through th sump. It will also allow me to satisfy my gadget fix as I havent made any new equipment purchases in some time and that gives me the shakes!
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