Not to be cold or flippant but it kind of tickles me how people get distraught over the untimely demise of a fish. I do too, to a point. If it's something that I think is going to be an extinction level event in my tank and I'm going to lose all my fish I do get pretty freaked. But think about this. Have you ever strolled along a creek bed or lakeshore and seen dead fish ? Yes, you have. Fish are a lower life form that number in the gillions and it is impossible that you will never lose one. Yeah it's a drag but use it as a learning tool. Figure out the reasons and be glad when it's not your favorite Betta but just one of your three hundred guppies.