Neon tetra sharing a tank with small angelfish?

First a 16 gallon tank is to small for even 1 angel. They get about 5 inches long and can even get 13 inches tall. They need 30 gallons minimum and 10 gallons for additional angels.Your fish will get way to big for your tank. Second the angelfish will eat the neons in the future. They are cichlids and are a little aggressive.