first things first, an easy way to post expense charts is to copy/pasta into google documents spreadsheet.
second thing, if you're a network engineer, you're gonna need one of these: http://www.neptunesystems.com/ We'll see you in the appropriate subforum when you've made the choice that 90% of all reef technologists use (where's my dadgum commission from neptune...):
third thing: a major issue that folks seem to have with office tanks is temperature control. many office buildings shut down the AC at night, and it is very hard to keep a tank at a decent temperature with no indoor AC. at a bare minimum evaporative cooling can help keep you in the low 80's. however with a tank that small, you could evaporate a large percentage of your tank in a single day without an ATO. good to see that it is in the works.
here is a gif commemorating your tank build post:
Look forward to seeing pictures!