The thing about Tiger Barbs is that no matter the tankmates (any temperament, tank area, shape/color, speed, etc - the only thing that can stop them is size!), the Tiger Barbs might kill them. It depends on your school. If you can, try to select the most docile Tiger Barbs at the LFS
, if you want to risk it.
By the way, even size doesn't guarantee safety. I read one thread where a school of 9 tiger barbs destroyed a tank, including some medium-sized cichlids.
I kept tiger barbs in my first tank and they were definitely killers.