They began as eggs and when they hatched, they hung onto a leaf by their heads (where their parents spit them) until they grew large enough and strong enough to pop off and swim. When they began swimming, they were barely larger than a pinhead and they were shaped like torpedoes and transluscent.
As they grew, they formed the fins that angels are known for.
When angels are crowded, their vertical fins are stunted and they end up squat and football shaped. When they have plenty of space to grow, they form beautiful, high fins.
Now that they are one month old, I am weaning them from the live brine shrimp they've been feasting on and have begun feeding them finely ground fish food flakes. They are now beginning to get their colors. The colors will continue to form until they are several months old; as they grow older, the colors will be deeper and more vibrant.
Here is a fun video of the four baby shrimp in their own 20-gallon tank: