Aside from a trap there are a couple other techniques you can try:
- stun them momentarily by turning on the lights in the middle of the night (works only if they sleep in an accesible area)
- leave your net(s) in the tank for a week or two so that the fish get "too comfortable" with them.
I don't think any one technique will be a sure thing. Chromis are small, fast and quite smart. As a result, they can be near impossible to catch in a reef tank with a lot of live rock and other obstructions short of tearing the tank down. Ever wonder why LFS always keep their livestock tanks relatively bare?
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