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The reason I went with the 1 1/4 is I thought that with the 5 foot vertical return that I would get them most pressure back to the pump. I don't have any issues with bubbles in the U-Tube siphons? Yes I do have a ball valve on the return line. I top off my water every other day but I am always...

I have built a 30g sump for my 75g reef tank. I have a dual outlet hang on overflow with 2 1" PVC lines going into my sump filtering through 2 of the filter socks. I have a 950gph mag drive pump pumping the water back into the tank through a 1 1/4" PVC return line with an in line T and a valve...