I have a 90 gal
tank (used - was given to me). It has a built-in overflow in the corner. I just set everything up in the garage for a test run. Pump and sump worked just fine. Problem is that the water goes into the overflow and falls nearly 2 feet, which is quite loud. There is a 1" tube that comes up a few inches that the water goes down into to go to the sump. My idea to make it quieter is to extend that with 1" pvc
so that the running water level in the overflow is just below the water level in the tank. This way the water will only fall an inch or so.
Has anyone done this? Do you foresee any problems with this? Better ideas? Before I got it, it was setup as wet/dry with the bio balls in that chamber. I don't want to have wet/dry since so many people advise against it for a reef.