it depends on what kind you want to keep i think. In my case, in my 210, I had a pair of Ocellaris that were adults and spawning. I added a tank raised pair of Tomato Clowns a couple years ago. Everything was fine, each pair had an anemone on opposite sides of the tank. eventually the tomato clowns grew to breeding age and once the female started laying eggs, she dominated the tank and would likely have killed the larger Ocellaris female had i not removed them. Good luck!
bob