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I don't think my powerheads are too great, as I cannot tell who made them. They do have great flow however. That aside though, I notice the venturi effect doesn't work when I have the powerheads lower in the tank, I suppose they just aren't strong enough to pull the air all the way down the line to mid-tank or lower (6' 135g). I just have an air pump split between the two powerheads to make it happen for me.
 
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