Just make sure you get a tank lid to reduce the chance of them jumping over. Ten gallons is just...WOW for me. My mom won't let me get something higher than 1.5 gallons. I'm sorry for your little guy. It actually wasn't your fault, he decided to do the Leap of Faith, or more likely, the Leap to Heaven.
I do have a lid over the tank. I still have no idea how he got over there. I think he was just a little more aggressive then Alpha. And he wanted to go over to his side.
But now Alpha has a 10 gallon to himself with some shrimp and snails.