You should, however, check the temperature for a few days. Sometimes the thermostat temperature on the heaters isn't accurate. I have some heaters set at 76, but they actually turn off at 78.
Yah, do what lotus said...sounds like an awesome saltwater tank! If I were you, I wouldn't go anywhere for the next hour after turning the heaters on... You really want to make sure the right temp. is being produced...