I run 2x 400w MH, 2 x 110w VHO, 2 x250w heaters, a MAG 18, 12, and 3, 6 maxijet 1200 powerheads, a fan, a 44w Tunze stream, a 18w NO lamp, a small pump for reactor feed and a 19" color tv on a single 15A breaker. If I turn on my lamps in the living room, the breaker trips, so what i have is very near maximum. You should be OK. Ideally you would like to split things over 2 circuits.
And for all you technical types, yes, I'm aware that my house is going to burn down!!
I'm working on it....