Also, one more thing that I do remember most about the combination was that it always seemed that they had a pecking order. The blue dominated the feeding area. The potter was more secretive and meticulous in it's feeding and movements, and the flame was my psycho-angel, always on the go. He booked around the aquarium in and out the holes in the rock, always moving and looking for a morsel, much quicker than the other angels. My blue had a cleaning relationship with the heraldi, pretty cool, and the heraldi did some cleaning on the blue. I enjoyed that combination.