are firefish known to be jumpers?

Yes, when they are frightened they will either dart into the rockwork or jump. I had 4 of them and one was always chased and finally jumped.
 
Yes. If they think they are chased or threatened, or sometimes if the lights do something crazy, they may jump. It's an escape technique that works in the wild.
 
Any of the smaller gobies would work. I have a geen clown, green banded and red striped in my 10 gallon. Neons would be good too.
 
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