If you are a novice, I do not recommend raising an Arhat, it is not easy to raise. You can mix parrots and maps, but when buying fish, be careful that the parrots and maps are about the same size. Parrot fish are less courageous. Maps or Arhats can drive the parrot fish, so that the parrot fish will be bolder. Try not to have maps and arhats coexisting in the tank. These two fish have a strong territorial concept and are relatively aggressive. When mixed, be careful not to have too high a density. I have 5 parrots and 1 arhat in an 800 tank, all about 12 centimeters, very harmonious.