Whoa, check out your stocking. Not good. You are overstocked. The Clown Loaches will easily reach 12-14"+, and the RTBS will eventually kill each other off untill there is one dominant shark left. The Angles may also eventually be a target to the barbs nippy behaivor. What type of pleco?
You will need to take some out.
As for breeding, it is very unlikely, espically with that set-up. Tiger Barbs eggs are usually eaten as fast as they are laid. They scatter them, so finding fertile eggs that havent been snatched up will be tough. All of those fish will see the eggs as a tasty snack as well.
For the best outcome, I would have 10+ Barbs in their own tank. But, even with that, it can be hard. I think I have read that soft wate helps, and if they have a bit of protein in their diet.