This death is so confusing, because it was so sudden.. Its like she was perfectly fine, and then gone. I haven't made any big changes to the tank.... last water change was a week and a half ago. I was feeding frozen brine shrimp, and she didn't come up to ravage them with the rest of the tank... I knew something was wrong, she loved brine shrimp. It was so sad to see her upside-down on the bottom of the tank. I feel a bit paranoid for the other fish now... I hope this isn't something that will spread to the others...
Thanks for the feedback, Fear_The_Loach. Fish are mysterious sometimes, aren't they?