Most extra large systems i've seen use 2 large retail skimmers rather than one custom. Seems like a great system for redundancy, etc. Larger doesn't always mean better, I'd take 2 BK mini's over most 300 gallon skimmers. If you're planning on spending a bunch of money i'd go for 2 smaller ones. But, 250-300 gallon rating isn't a HUGE skimmer, so there's lots of available options that will skim damn near anything you have, unless you're going NPS :P.
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