I have been wanting to add angelfish to my tank for awhile but wanted to wait and let all the other fish get established in the tank. I know they can be nippy to fish like guppies, which I have. I've also heard that by adding the "aggressive" fish later on in the process at a young age they will actually fit right in due to all the other fish being there first. Any truth to this, or any comments on the subject. Thanks,