I've had this filter for about 5 months now and everything has been great. It's not as quiet as I've heard it should be, although I don't have anything to compare it to, just what I've read from other folks that have them. Anyway, I took it apart 2 days ago to do regular cleaning and now it has a most annoying rattle. It definately sounds like the casing, not the motor, but I can't get it to stop. I took it apart again yesterday just to make sure I put everything back in right, and it was quiet for a while, but then the rattling started again. My tank is in my bedroom and this is driving me crazy. I've always heard that AC
's were silent...so far my marineland is much quieter, even before the rattling started. The top can make extra noise, but this is something else thats wrong. Any advice?