The Mag 9.5 raised my tank 2 degrees, I had a Sicce Syncra 3.0 and it didn't raise my temp, I just switched over to the Jecod dcs-6000 and have no temp increase even at full throttle.
I might do that in the future. Don't really feel like taking everything out right now though. Is the performance of the skimmer any better or worse vs the mag 9.5?