Umm, don't remember. It cycles back and forth between two ports at a time. The two behind the rock kick in and push the water forward. Then the two in the front corners push it back and up towards the overflow. Then it will cycle again.
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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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