3/8" should be fine. Be careful with sand in the pump, the bearing at the bottom can be damaged and will result in an error shut down, it is a cheap piece to replace but if bad the pump won't run.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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