Sounds good. Ya, you may even want to set your chiller at 81 if it behaves the same as mine, turning on 1 degree higher than your set point and off 1 degree lower. Your chiller will have no problems keeping your tank cool, my 1/10th chiller is just barely good enough (I will upgrade to a 1/5th within a year I am sure) so I set my chiller at 80, so when it hits 81 and turns on I still have a good 1 degree of buffer room in case the chiller can't quite keep up. On yours, you know it can keep up, so setting it at 81 so it turns on at 82 it should never get over 82.2 really. Your power bill and your corals will thanks you for it also. Try and set your heater to come on at around 79.8.