20-30 damsels or cromis in a 120 reef?
Firefish are probably the worst fish to place in a 120 gallon. They are sold as fish which can get along with multiple fish in the same tank but, in my experience, you will end up with two. A dominant high swimming fish and a beat up smaller fish that hides in the rock.
Chromis (green or blue) would be the best but I would not recommend any more than 8 of these at one time. If you have other fish they may not get along with them.
Good luck on your choice.
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