Oddly,or maybe not lol, my biggest indo in my group of four is the most moody and timid of them.There are days when it will sulk in a corner and will then move out to eat the falling pellets with the others only to allow itself to be pushed and shoved aside by the smaller dats as they snap up the food
I dont get much squabbling out of them and that might be due them being together for so long.One of them does have a "v" shaped tail fin due to some long ago fight with one of the others.The fin seems to have healed that way and will probably remain so.