I have a large adult Emperor Angel which I will be moving into my 210 gal. aquarium. I would like to get a Blueface to put in with him. If I get a Blueface that is a smaller than the Emperor should I put the Blueface in first and leave him for a few days before putting the Emperor in, or should I put them both in at the same time? Or is it a bad idea getting the Blueface altogether?