No questions asked, it should be on a surge protector...
I know, i have an apex (it is fantastic) on a 125 gallon, and we had a bad thunderstorm, the power went on and off a bunch of times, and a few computers were destroyed at the school. Our apex got corrupted, and got so messed up I still don't really know what happened.
Called Neptune Systems, and they told me to use a surge protector to prevent future problems.
It is definately on a surge protector now, $100 of fish lost was more than enough of a reason to put it on a surge protector.
Hope the helps.