That sucks, i don't think the MH in the tank would cause a crash unless the centre arc tube dropped in the water as well, there could be some nasty stuff in the tank then. As for why it exploded, they can over time, manufacturing defect, etc. but if you've been running it awhile, then might have just been a gust of cold air as it was cooling down. I cracked one a couple weeks ago testing it, then walking outside into the cold. The temperature drop popped it like a balloon.
As for most recovery's, water changes and carbon will be your best bet. I'm just getting over one and it SUCKS... but even some coral that had totally bleached is actually returning.
Hope everything gets better.
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