A couple of weeks ago I bought some bloodworms, the freeze dried variety. I have been feeding them every other day or so, as a treat. Well, my wife and I were looking at the tank yesterday and she says, "That angel lookslike it is psychedelic or something." I lookes more closely and saw that there were small metallic blue spots all over the head and fins of one of the angels. Upon further inspection, ALL my angels have gone through this change! Almost any spot that was white is not metallic blue - almost like a discus coloration. The only change in the tank was the bloodworms, so I am giving them the credit. I will try to post some pics soon, but it;s hard because you have to catch them in just the right light.