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I recently upgraded from a 58 to a 120 and have noticed that the overflow on one side has started making the "flushing toilet" sound. Does anyone have ideas on how to make it stop?
Also, how far below the water line is the outlet for your overflow drain in the sump? If it is more than a couple of inches, it can cause some excess noise as the overflow line fills, burps, dumps water, fills, burbs, dumps water, etc.
I would consider going to PVC with a 90 leg in there somewhere. It did wonders on my tank. You can wait for further advice though - some one might have a better idea.