I would mimic everything that Mike just said. Barracudas need a ton of space, even when they are small.
On top of everything that Mike said, barracudas do much better when in groups.
Furthermore, small barracudas are very young. For this reason, they do not make good aquarium candidates when they are this small. When they get bigger, they do not make good aquarium fish either though, since they get to be 5 feet long.