pump cleaning

A small firefish was in my sump and got sucked into the return pump. How do I safely remove the RS Max S Main 7000 return pump and clean it?

I just went to restart my tank after a few years out of the hobby and my protein skimmer pump isn’t pushing water. It’s an AQ 2000s. It hums but won’t actually push any water. Anyone got any ideas on if I can fix it or am I just better off buying a new one.

I have posted bits and piece of my vinegar story over the past three years, and I thought it would be beneficial if one post contained all that I've learn. You'll be surprised! This story will contain three parts; my history with vinegar, the cause and simplified chemistry what's happening...