Damn Jon, looks like you took a picture of your tank with one of those bleak (B&W) instagram filters or something. Only color I see are the brown palythoas at the bottom.
Oh well, it happens. And assuming this was a temporary mistake that caused this, you can get back up on that horse. Clean up whatever mess (if there is decaying matter still in there), remove skeletons, and figure out where you want to go, corals, fish, whatever.