So Id like to do something interesting with fish in my tank. I have a large sohal, a small hippo tang, and thats about it for large fish in my 220. Its plenty large to have a couple more fish. Im considering doing a trio of yellow tangs. Is this feasable? Anyone have any experience with this? Whats the possibility for success if they are all the same size introduced the same day? Thought of adding 2 more hippos, but since him and the sohal are acanthurus figured the likelihood for problems were increased. Thanks.