The Clown should hold his own against any of your other fish, even at his smaller size. It's the appetite that is the hardest to get them acclimated to.
They are my favorite of all the Tangs, I had a really healthy one that was growing like a weed until the 300 gallon tub he was in cracked! Came home that night and 300 gallons of water running down the driveway!!!
I can't wait for my new system so I can get another one.
Best of luck with him. Your set-up looks great!!!!