Noisy pump in Aqueon 55/75
I've been having this problem for the last few weeks now. I've noticed that everytime I change the water in my tank (and shut off the pump when I do it), the filter is loud for the next few days, then it seems to quiet down.
It's not the water sloshing around in the sump, it's definitely the impeller. I've taken the pump off, but from what I can tell, the most you can do is rinse it out. I can't see anyway to disassemble this to clean/inspect it or replace the impeller itself.
I'm about ready to just shut it off and toss it since I'm running two pumps and the other one us just about silent, but I really like the idea of running both of them so I'd rather just fix this one.
Looking around online, I see I can buy just the impeller, so I have to assume it comes out. I suppose I can try a bit harder. i didn't want to pry at it too hard and end up breaking something, but I didn't even see anything that looked like it would come apart to give me access to the impeller.