Rob,
You have my condolences, my friend. I can completely relate to your situation as my tank had crashed a few months ago while I too was away for work. Something had caused an
ammonia spike while away (I suspect my 6-Line as he was stuck to the side of my powerhead intake filter... or atleast half of him). I lost all corals and only my two clowns and their anemone survived. I was horrified when I came home... needless to say, I will never go away again without having a "tank-buddy" care for my tank.
Joseph