A few weeks ago i bought a coral beauty for my 40g tank. 2 days ago I bought a fire fish. I was planning on getting 2-3 because I know they are better in groups, however the fish store only had one. I put the fire fish in that night, and the next morning i couldn’t find him. I assumed he was hiding, which he was. I waited another day without seeing him and I decided to lift up the rock where he was hiding and it swam out. The coral beauty immediately went after it and picked on it. The fire fish went back under the rock. So i knew throat wasn’t good so i tried to catch the coral beauty and put it in a breeder box to see if they would adjust but i had no luck catching him. so i ended up catching the fire fish and letting them get used to each other. I’m planning on getting more fire fish like i said, but in the meantime, while the fire fish is in the breeder box, what should I do to prevent aggression. I feed the tank misis shrimp and brine shrimp daily. Any suggestions?