Not enough room in the tank for a group of tiger barbs. You want a tank about 3 foot long to keep a group of 10 or more so they don't attack everything.
If you want a barb that looks similar but is peaceful, look for the ruby barb (Puntius nigrofasciata), but again they want some room to swim so 3foot is a better size tank for them.
Cherry barbs (Puntius titteya) and checkered barbs (Puntius oligolepis) are smaller and peaceful and will live in a 2 foot tank.