Originally Posted by BrendaC
Its a FOWLR tank. I already have the maroon clown and the flame angel.I wanna buy the karan angel and the treadfin butterfly and a racoon butterfly.
I believe what Lion is concerned about is if you buy those three fish and add them at once, your bioload may shoot the ammonia up beyond your system's ability to deal with it, endangering all the tank's inhabitants.
If introduced one at a time, with sufficient time in between, then it merely comes down to a compatibility/tank size issue.