What is the most logical next event?

How to care for an angelfish
Choose the right size tank.
Even if your angelfish is small now, it will grow. Angelfish can grow to be about 6 inches long and 8 inches tall.
When selecting a tank, make sure it's at least 55 gallons in capacity. If you can afford a tank bigger than this, and fit it in your home, bigger is always preferred.