I finally moved my fish to a 10 gallon. You can see on the far right my new fish, Excalibur, who had already gained some color in this shot from what he had looked like when I got him. The best part about these fish, particularly him, was how their colors changed from time to time. Excalibur's tail in particular tended to range from little color, to more yellow, to more violet without any given reason except perhaps mood.