The 110 Aquaclear that came with a 65 gallon set up I purchased off Craiglist makes a fair amount of noise when it runs. I'm not referring to the waterfall effect into the tank, rather what sounds like the impeller rattling a bit. The owner said he had purchased it new six months ago. I read online that you can swing the motor/pump out from the housing to access the motor/pump and impeller assembly then pull out the assembly to clean, lubricate with vasoline then reinstall. I did that , but there is no appreciable change on the level of sound. The aquarium is set up in our dining room, which our family uses regularly; Any suggestions on how to make it run quieter or what to replace it with?