I got a new aquaclear 110 and it is in the room i sleep in and it is really noisy. I removed the lid and the noise is still there. it's as if the impeller is rattling around. I need help fast, this is really annoying!
Disassemble the motor and see if theres any sand or debris. Its really easy. I believe a quick google can tell u how.
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Call hagen have them send you a new impeller shaft if it has not gotten better. 6 months down the road when it gets loud again replace the shaft with an eheim ceramic shaft which will last quite a bit longer.
I've found that new and newly cleaned AC's tend to be loud. If you leave them alone for long enough they build up gunk/slim that tends to coat the impeller and quiet it down.