maybe i need to feed them more ften so they won't pick on each other. said:
That doesn't help... When you get chromis, get about double what you plan on keeping. Make sure its an odd number as well and wait it out. The last bunch I put in actually kicked one off the isle before settling down into a happy community school. Adding an aggressive fish into the tank also helps in my experience, since it triggers their inner survival instinct (safety in numbers). I think they are more likely to do the culling when they feel comfortable and safe all the time. In my case the 6-line I added tends to pick on fish from time to time and it keeps them on their toes.