The purple can give you some trouble. My friend bought a sohal for his tank which has a large purple in it and he put the sohal in an acriylic tank (kind of big rearing tank) and put it in the water for an hour. At first the purple gone mad, showing his blades and swimming around the tank aggressively. After an hour or so the purple was tired and acting normal. When we opened the trap and free the sohal we gave some food to the tank. After purple ate his snack he started to chase the sohal but not as aggressive as when the other fish was in the rearing tank/trap. We watched the tank for an hour or two carefully. Sometimes we chased the purple tank with a tong. So it took like four hours, but they didn't chase eachother since.