Parrotfish Cocoon Mystery Solved?

Photo Credit: Lexa Grutter
Very interesting. After reading this article one question came to mind... The parrotfishes have found a way to protect themselves during night-time rest. But, they still spend a lot of time at cleaning stations during the day. So, are these fishes MORE prone to attack of Gnathiids than other fishes? And thus have developed, at least during night-time hours, a way to prevent it? Hmmm.