I have a 10 Gallon currently housing 2 mini lobsters, 1 Mystery Snail, 2 yellow german guppies, & 3 Blue neon guppies. The neon guppies were added yesterday afternoon (5:00pm). All looked fine & healthy. Tonight I got home from work (930pm) & one of my blue neon guppies tail looks like this! What is it? What can I do to help him?