I actually did the same with some Convicts and my big Zonatus. Not only didn't he eat the Convict...the fish lived with Blue for almost a year. It was hilarious.
For the record, I have personally been bitten a half dozen times over the years. ALL of them by a managuense...most of them by the fish I called Jumbo. He was the only fish I had to distract on one end of the tank while I put my hand in the other end. One time I was reaching across the open tank to pull the shades and he literally jumped up and out of the water biting the back of my arm...hung for a second then splashed back. Another time I had a TV crew over to look at the collection. The reporter was filming Jumbo's tank. I said, if you open the lid he will come to the surface to see you. She did...and he did jumping up and damn near biting her nose.
Here he is during a water change. He was psychotic.
That's awesome and hilarious. I remember when I was on the forums yeeeears ago Jumbo was only about an inch or two long. Really cool to see him all grown up.
What a bruiser