For going out of town or vacations..I just have a co worker drop in some food pellets every couple days. If your going to do a tank at work....I would definately go with the biocube 14 or 29. You can go longer on water changes if you need to but wouldnt make it a habit.

I understand your pain.. it is really tough sometimes to decide between a beloved coral and/or fish. Or even between two fish as sometimes there is a lot of incompatibilities that we try to turn a blind eye to.. but eventually it catches up to us until we can't ignore it any longer :-( There is usually no easy answer to the dilemma.

Or you can put on an auto-feeder. Those work well too. And if you have a ATO then you don't really need a co-worker for that. You would just need to train someone up in the event of an emergency. No different than with your tank at home, except that you may not trust your coworkers to know what to do in the bad case scenario.

I have found that on my biocube 14 that I only have to add maybe a glass of water every week.....the water cant evaporate out which is why I love the lid design.