The more angels you have in one tank, the shorter and squatter they become. The more space each one has to grow, the more likely they are to have very tall fins.
It is difficult at this point to count the fry, but I believe there are close to three dozen in this 20-gallon tank, which should give them plenty of space to grow over the next few weeks. When they have reached a body size of a quarter, they will go to the local pet shop. Some breeders sell them when their bodies are the size of a dime. I believe this is entirely too small, as the water changes from the breeder to the pet shop and then to the buyer's tank often results in high fatalities.
I changed the water the day before this video was taken. Water can become very dirty with babies, because of the brine shrimp that is fed to them - it creates cloudier water than fish flakes, which they won't be able to eat for several more weeks. During the water change, I removed the plants. This confuses them for a day or two, but it makes it more likely for them to get used to me, so they won't hide from people in the pet shop - or in their new home. They'll come to associate people with food.