Whatever creature is nipping at my favorite zoas in the dark of night, yet to be identified.
For those with nasty yellow tailed damsels, I got a small blue hippo tang that chased mine to the ends of the earth constantly. I really think the hippo was trying to school, the stupid damsel appeared to be running for it's life. One morning, the damsel was dried up on the floor and the hippo seemed sad to have lost it's friend. I did the happy dance thinking about the hours and hours I spent trying to catch that monster.