I have six discus in a 65 and sometimes they seem a little skiddish and overreact to movements in the room. I know they trust me, they'll eat out of my hand and come to the front when I sit by the tank. Anyway, can a small group of cardinals work like a Xanax? I put some danios in another tank once and it brought the other fish out more. Would you guys suggest me trying this with the discus?