I'm probably not qualified to help, but I'll try anyway. When I set my new aquarium up a few months ago, I was surprised and disappointed at the amount of noise coming from my overflow and return pump. As the system breaks in, it is getting noticeably quieter. Maybe you'll have the same experience?
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90 gallon tank
2x AI Hydra 26 HD, Reef Octopus 110 skimmer
2 clownfish, 1 damsel, 2 diamond goby, a coral beauty angel, and a sailfin tang
Assorted zoanthids and other hardy beginner corals....
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