ha, i had the same situation man. i started with a 5gal hex, then not 2 months later had a 10gal, 20gal, 30gal fuge purchased w/ 75 gal tall reef ready tank lol. so i know how that syndrome goes. id honestly recommend you just take some of the barbs back to the LFS if they're just going to cause you grief. if you prefer to keep the pictus and the gouramis and leave it as a non-aggressive tank do so and rid yourself of your problem fish. it sucks to take a fish back to the LFS but sometimes we have to. oh, and yeah 6 barbs in a 10 gal is too much. i had 3 in a 5 gal and 2 months into it i had to move them into something bigger.