In addition to nori, spirulina, flake and the ever popular brine shrimp, what are other greens that are desireable for maintaining the health of tangs. I hear of lettuce, broccoli, zuchinni, but would like to know how these should be prepared and offered. I do soak all my food in selcon as well, but want to offer an optimum diet for a new juvenile purple. Thanks very much for any input.