TANK CRASH: MH Exploded?!

[GMGQ]

This morning as I was just about to leave for work, i glanced at my tank and it was cloudy. I went over and all the SPS are bleached :S Urchin was DOA in the corner, LPS and zoos all closed up and/or spewing :S

Then I looked up and saw one of my Radium 250W SE MH bulbs was broken! The end of it was missing. It must have happened sometime last night between 6-10pm, because I came home after work and it was fine. I couldnt find the glass in the tank, but I was too busy doing damage control to really look.

I immediately started doing a water change, but I only had 10gal of change water on hand, better than nothing. The skimmer is going crazy, but I've extended the drain tubing into a bucket and letting the foam drip into there while i'm at work. I also changed out the carbon reactor with a fresh cartridge of ROX1.3.

The change water tank is refilling with RO water right now, I'll probably boot home to check on everything at lunch. I'm going to have to make more RO water tonight and do another big water change as soon as I can.

Another reason could be that I dosed 1 packet of maracyn yesterday morning to battle some cyano. I've used it before and had no issues though. I put in 1 packet, and my system is about 80gallons. When I looked at the tank after work yesterday, most of the cyano had turned stringy and was floating away. None of the corals looked affected. So I'm still thinking it's the MH.

Any tips or explanations what the exploded MH did?? The metal bits inside still seem to be in tact.

Thanks everyone.