No. Not with T5's. You will hardly see a raise in temperature, and if you do at all, it will be negligible. Maybe a degree or a degree and a half.. if even that. I wouldn't worry about it at all.
I had the 48" Nova Extreme Pro over my 55G and i didn't see any temperature changes at all actually. It was always at a constant 79*. I did not have fans running over the tank or anything like that either. T5's do not put out much heat at all.