Bi color angel centropyge bicolor, the difference between adult and juvenile.

The main difference between the adult bi color and juvenile is the orange/red spot on the top of the cheek of an adult.
This spot is also the way to tell the adult male from the female, the larger the dot, then its most likely a male.
They have a semi pitchfork in orange as well near the gills but this is not overly noticeable.

Then the fins above and below the tail at the end of te fish are another way to tell, the longer these fins the older the fish. These are also for predation protection, the predator will usually attack/bite these fins and not the head.
Juvenile head


Juvenile tail


Adult head, this one is a female approximately 5 inches long, they get to 8 inches/20 centimetres in length at full size.


Adult tail