Wow , sorry no one has anything to say yet. So I'll put in my two cents. I don't have a AC (I assume Aqua Clear) but I have three HOBs of another brand and I have an XP3. I've also clean the motor (impeller) about once every two months, but I haven't cleaned my "motor" on the XP3 yet. It's been over a year since I've had the
canister filter. I clean out the media about every 6 months or if the flow rate slows down, but never cleaned the motor. I'll be honest with you, I'm afraid to take apart the housing and not be able to get it back together and I'd freak out if the filter failed because it's in my Discus tank!