Personally, I wouldn't do a huge return pump as too much flow through your sump can have several downsides including extra salt creep from all the splashing, but more importantly the water will be bypassing your skimmer too quickly for it to properly do its job. A big honkin' return will also use a lot of electricity and add a lot of extra heat to the system.
My trusty Eheim 1260 on my 150 gallon system only does around ~500 gph max at 4' and I even have it tee'd off to run a UV.
The majority of your display tank flow should come from powerheads (Tunze/Vortech) and/or a closed-loop.
Last edited by fkshiu; 08-24-2008 at 03:24 AM.
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