Dude do it you won't have to feed the Armatus for days. Lol! J/K As others said it's a toss up unfortunately. Arm's can be pretty unpredictable, heck any fish can especially when they're being moved to a new tank with different tankmates. It's not worth the risk though as an Arm can kill most fish with just one strike, and in my experience they aren't fin nippers but go straight at the body and can puncture a swim bladder or other vital organ with those teeth and an Azul is too cool to be a feeder or floating tank ornament.