The carboy sits on the floor right beside my tank and pumps up to the tank (no sump), so from bottom of carboy to top of tank is about 4 feet. NO PROBLEMS whatsoever getting the water to move that far. When I re-fill the carboy, I must remove the top up line from in the tank because of gravity syphon. And when I turn the pump on the water starts to move out of the carboy immediately. When it's empty and I pull the stopper out to refill there is QUITE a pressure build up. The whole setup actually works QUITE well if I do say so myself.
I almost forgot....... YOU MUST PUT A CHECK VALVE IN THE AIR LINE TO THE CARBOY, so that the water doesn't syphon back down the hose from the tank.
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38 Gallon Custom Starphire, Remora Pro, 2 Seio 820's, 24" Giesemann Infiniti 1x250W MH + 4x24W T5, 60lbs Live Rock.
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