Your tank is looking nice... I recently did the same thing...
When I put my MH on my tank I expected a big heat increase... however my Heater couldn't keep up with it and my tanks water temp dipped into the low seventies... and I had to add two more heaters just to bring the temp back up... I expected the MH's to do most the heating in the day and the heaters in the night... and I usually keep my house between 65 and 75 so I didn't think it would be a problem... but, I guess they don't heat as much as I heard... the do evaporate the water fast though...
Anyway, nice tank, and good luck with your move!