The OP said barbs, not tiger barbs. Makes a difference.
The OP said "green tiger barbs". I know I am repeating myself but that's what green barbs did to a cory in the pet shop. In the space of 3 minutes I was standing there it was attacked several times and I had to get it out. As you can see they've taken quite a chunk out of its dorsal fin. They've reshaped it's tail too.