firefish tend to be peaceful and pretty much mind their own business. How about you get a mandarin dragonet. That's the calmest and most peaceful fish you will ever come across! He bothers no one! He's always on one important mission.... finding food!
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30g reef tank, CPR CY192 filter w/ DIY plumb running Rio 17HF return, Coralife 3x 9w UV Sterilizer, 3 24W T5-Helios 10K Daylights/3 24W T5-Helios Blue lights, 2 Logysis blue meteor light strobes (moonlights/24 Blue LEDs).
Tiger tail cuke, asst. snails/hermits, asst. feathers, rainbow acan,zoos,shrooms,bubble,galaxea, asst. shrimp, 2 ocellaris,mandarin,zebrasoma xanthurum,pink-spot watchman,red-striped pistol. | 
Stocking Questions 
Same goes for the mandarin. Also, mandarins will not tolerate any other dragonette so if you already have, say, a scooter blenny, you're just asking for trouble. You also need a very mature tank to keep any dragonette well fed. 
