perch do ok in low DO from studies i've read - actually better than bluegill,, that being said, i would an an aerator myself.. i think a pump for a 100 gallon tank will have 4 outlets, and probably under 60 watts, but would have to double check those numbers..
while many species can "tolerate" low DO, it doesn't mean you'll get the best growth from them..having an aerator on a battery backup is a good way to make sure at least some o2 is getting into the water in the event of a power failure