Eheim 2217 noise
First post! Returning to the hobby after many years. I've set up an 80 gallon tank with sand, rocks, and an Eheim 2217 cannister filter. But...
I am absolutely at the end of my rope trying to get the filter to be even reasonably quiet. I've tried two filters and an ADDITIONAL impeller and shaft. I've tried two sets of tubes, release valves, etc. I've cut the tubes shorter. I've primed by sucking, started with the filter full, empty, etc. I've flipped the impeller shafts. Jiggled the filter to release air (although I have seen air in there a number of times). I've probably spent 30 hours dealing with this and read every forum post I can find.
Always the same result - a loud motor noise that is quieted somewhat if I press my hand on the top of the filter.
Could this possibly be trapped air? Neither of the filters have ever run quiet at all. I tried the first one for over a week, twice, and the second one has been running for three days. Is the distance from the filter - at the bottom of the cabinet - to the top of the tank 5 feet up too much? Could it be sand? I haven't found any in the impeller or top of the filter, but some does leak out when I drain from the bottom tube. I recently flipped the intake so it's at the top of the tank to ensure no sand gets in.
As I said, I am losing my mind over this. I have not added fish (although I started a fishless cycle) and I obviously want to resolve this before I stock my African Cichlids. The tank is prominent in our living room and while a low noise would be OK, the current level is unacceptable and I'm sure not appropriate.
At this point I would do anything, including buy equipment or a better filter, if one exists, to solve the problem. Can anyone help me?