Not sure if it's considered a crash but I went from 20-30+ guppies to 3. My colony has been destroyed. Anyways, here's an update on the symptoms. Symptoms of the most recent deaths have changed a little from the start. They start with a white patch on top of their head. Then their pectoral fins narrow. Their mouths are stuck open and "wiggle" in place. When i find them dead, the white patch turns into a little fluffy patch of fuzz, happened on 6, and their mouths are wide open.