What to do with electric blue johanni male that terrorizes my tank?

I have this vibrant colored male johanni in a 36 gallon brackish tank with another smaller male johanni and two smaller yellow labidos. its a week old tank and the labidos were the first to explore it. i had them set up with a good sized piece of drift wood, a small piece of lace rock, a large piece of lace rock, and a piece of beige "holey" texas rock. the johannis were added two days ago, along with a large piece of lace rock on top of a piece that the labidos were not interested in. the vibrant male johanni started beating on every other fish in the tank only 3 hours after he was added. although, he did find a nice home in the new lace rock. the problem is, i don't want to have to take him back because he's a beautiful fish, so i was wondering if adding more fish would help?