Set up my new eheim 2217 about a week ago, and dam this thing is so much louder then my fluval 405. I keep reading that they r silent but not the case for me. I followed eheims mickey mouse instruction booklet for setup. Any pointers on quieting this thing down? I have been trying to figure it out to no avail. One thing is when i plug it in i can see the top suck down about an eighth on an inch is this normal? Not impressed with my first eheim product. This thing is louder than my fx5s.