It could be the room temperature of the office thats not helping you. I noticed when my room temp was mid 70s, the tank would heat up a couple degrees when the lights were on for long. Now its getting colder, my room temp is mid 60s, my lights were on all day today and it didnt budge at all. I have my heater set at 77 and so far it has been sticking at the temp even with the lights on.
Is your tank near a window, or heat vent or anything like that?
Moonlights are great for viewing critters that only come out at night. I see most of my tank activity at night, worms, shrimp, crabs, amphipods...