Lol word on the street....Ive heard that if the neons and angels are raised together they will be ok, but if you added another angel after that it would be a picnic for the new angel.......Correct me if im wrong
My assumption is that if you put the tetra's in after then they would get eaten as the angels have already got their territory and are already use to their surroundings, but im not sure, as i said im not really knowledgable about fish as of yet. BUT my logic tells me to try and get them at the same time or neons first. and get the angels when they are babies