Thanks for all the advice.
I think the easist is to just keep the pump running 24/7 and reduce the flow as Tom R suggested. The problem with making any mods with the GroTech filter is I need metric plumbing supplies.
Here is a link to a mod similar to what andestagg is describing: http://zeovit.com/forums/showthread.php?t=3500 (sorry it is in Spanish but has nice pictures).
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300 gal starphire custom built in pentagon reef (+90 gal sump on Blue Line 100 HD return pump, 210lb LR, Euro-Reef RC250 skimmer, 2x400W MH, 2x28W compacts, 2xTurbelle classic 4002 pumps & Turbelle Stream 6100 on 7095 Multicontroller, running ZEOvit)
Livestock
Fish: damsels; sailfin, yellow, regal & naso tangs; ocellaris & tomato clowns; lyretail anthias; foxface lo; flame angelfish
corals: a few
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