Question

If the tank has a proper lid a firefish can be happily placed in a 20 gallon tank.
 
Can I get a fire fish for my 20 gallon reef tank?
Most definitely. Do note. often more than one may fight resulting in death and best in odd number groups. . 1-3-5 and so forth and they are subject to bullying from aggression
 
According to your other thread you added a domino damsel already, so it might be hard to add anything more. Those fish are aggressive.
The domino I had in my 150 gallon was named Napoleon for a reason. I doubt a firefish will have any peace in your 20.
 

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