It sounds like you are attempting to get ALL of your circulation through the use of the overflows and returns. This may or may not work. Most people choose to use a lower flow through their sump/filtration system and add more circulation within the tank via powerheads or a closed loop system.
I "was" running a 65 gal tank that the overflow was rated at 1200 gph. I added a closed loop system to it.
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150 gal Custom. Born 5/7/07. 50gal, 29gal, 20gal Sumps. 30gal Frag Tank. ETSS 800 Skimmer, Deltec APF600 Skimmer. PFO Solaris Lighting on Display and Frag Tank
My Tank Thread
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