I had a similar noise when I was setting up my tank. I am using a herbie, and although I could dial it in so I was getting no suction noise, the noise of the water splashing over the overflow was louder than I wanted. I just went 1 step down on the return pump (speedwave). Works well so far, but my next task to to get my reactors online, which are T-ed off the return pump. This will mean I have to step the pump up again, which will mean more adjusting.
- Ian
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