07-16-2008, 06:40 PM
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Eh, I had the worst experience with Tiger barbs. Started off with 8, and went down to four before the one dominant one kept killing the new barbs and started to attack my other fish. I wouldn't reccomend them to anyone, but in answer to your question, they should be able to defend themselves unless it is like a bad beating thing.
You like the more aggresive fish, correct? The first thing I thought of were maybe African Cics, but you would probably have to get get rid of the Knife then. If you did, then *maybe* Demasoni Cichlids (not sure if the tank is big enough). Those are aggresive little buggers.
If you want to keep the Knife, then Tiger Barbs are really the only thing I'm finding that should fit. Just be sure to get a large enough school, or else you will find out why I got so mad over them. Maybe like, 10-12?