i got baby caribes awhile ago there are 4 in a 60 gallon tank, they are about 2 inches right now , i dont keep a light over the tank so its usually pretty dark, tonight i noticed my biggest caribes eyes are like popping out of his head!?! the others eyes look fine but his look like there protruding. he hasnt been picked on hes the biggest of the group, what should i do????? hes swiming ok but i noticed him just hanging out at the top the other day.