My experience is the same. Started with 5 now have 3. The first died quickly- he just never seemed to settle in. The second died a couple of weeks later. Same symptons- shortly before they died they both looked like they had a few nipped fins and even though they were part of the feeding frenzy and were getting some food, they just wasted away over a few days. The 3 left seem to be ok though the big one does nip at the other 2, plus at my 3 ocellaris. I've read that clowns can harass the chromis, but in my tank now it seems to be one big free for all. I only ever saw schooling behaviour in the first couple of days.
Not sure adding more would help. I bought 3 initially and then added another 2 about 2 weeks later. They mixed quickly but then the big guy (who came with the second 2) started flexing his muscle.
One thing to add- I never did see the big guy actually getting a piece of the smaller ones, and the two remaining smaller one are still ok. The damage seemed to occur over night.
Interesting thread- I was not expecting this behaviour either.
Ed
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