growth rate of my angels?

Hi! This question is about two of the angels in the picture below. Sorry for the poor pic quality. I will refer to them as angel A, which is the one "up front with the two black stripes on tail fin". And the other as angel B, which is the small one, "side view with the "red" eye". The other two angels in the pic I don't have anymore. question is below the picture.




This picture was taken last august. But I got both these angels last May. When i bought them, angel A was perhaps a little bit smaller than he is now. Angel B was very small, dime sized baby. I know one is a male and one is a female because a few months ago, eggs were "laid" and fertilized, but got eaten. I don't know which is which tho. Angel B was the one guarding the eggs trying to keep the other fish away. Anyways....back to my question.

So after 10 months of having these two angels in the same tank, fed the same amount, same everything, etc, angel B has grown so much that it's actually a touch bigger than Angel A now. Why would angel B grow so much, while angel A has hardly seemed to grow at all?
The tank is a 46 gallon heavily planted. All parameters are good. Water changes every 7-10 days. All fish are healthy and active. Angels share the tank with 9 cardinal tetra's, 6 corycats, 2 bn pleco's.
Any thoughts? thanks!

Thanks, Sonycrr!!

bump!!

soooooooo does anyone else have a answer/theory or has sonycrr said all there is to be said?

these angels are close to or over a year old by now but I feed a rotation of high quality flakes, brine shrimp, and bloodworms. I feed once a day. I do a 25% water change every 7-10 days. The water temp is 78-79 degrees. this routine has been basically the same for the last 10 months.