Take a look at the tunze 9410 dc.
I have been running one in my 120G for 15 months.
Easiest skimmer to clean, you dont even have to turn it off.
Anti overflow.
I have not adjusted it since I turned it on 15 months ago.
I have taken it out twice to clean. Put it back in, turned it on, and it was right back to doing its job with no adjustment.
No need to turn it off when feeding or working in the tank.
Very underrated skimmer.