02-02-2013, 06:14 PM
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Nothing is going to change their inherent behaviour. If you do not have a tank available for the barbs, and for a proper-sized group which means 8 or more, I would get rid of them by whatever means you can.
You have at least learned a very imoportant and valuable lesson. Always research any fish before buying it, to ensure you can provide what it needs. And this means numbers (for a shoaling species like barb, tetra, rasbora, danio and some others), minimum tank for the mature fish, and suitable environment (water, decor, other fish, etc). We all had to learn this. I lost many fish before I did.
P.S. Welcome to Tropical Fish Keeping forum.