I added this little guy who is about 2.5 - 3 inches in length just 2 weeks ago. He is currently eating frozen krill-Kabobs and only seems to do so after following it around a while. i've noticed if he has any question of fitting it in his mouth, he wont eat. i'm cutting the krill in half and using a bbq skewer to entice him with it.
When he sees the food, he gets so excited he literally wags his tail fin and acts like a dog who's owner got him a fresh bone. Soon, i will video this.
He's the 2nd one i have had. I traded my other one 3 years ago to a fellow reefer (raptor) because he was simply too big for his tank mates and was able to eat them
They are not good swimmers so they perch on the rocks most of the time and scooter around the tank to get around. I do catch him swimming in the koralia current quite a bit though.