I have a flame and a potters angel together in my 180G. You have a 120G, so you may be ok... However, the first fish may be territorial for a bit, so it is a chance you take.
Personally I had my first flame angel dissappear, don't know where it went, so after some time I replaced him. My potters did chase him for a few days, but after that they were ok with each other.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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