The blue male is about 3" and the rest are along the lines of 2-2.5". He's actually more of a purplish powder blue in real life with yellow enveloping the dorsal and anal fin which is also lined with black, it's just the flash that washes the color and intensifies the iridescence. The tail's yellow. The ventrals are yellow with a black line and white lining too. The others, I notice bars on once in a while, but they fade in and fade out.
Without flash, I can not keep them still for a good picture. I hope this info helps.