rabbut
I don't bite, all that often...
Angels can eat either Neons or Cardinals, so it won't make much difference either way... The trick is to put the Tetras in first, and then the Angels and they should leave the Tetras alone as they've grown up with them without thinking of them as food
Once you add Tetras to a tank with adult Angels, you get trouble, as they are used to you opening the lid and adding food, so when you open the lid and add some nice new Tetras, they think dinner is served and they become an expensive snack, along with any that were in the tank before the new Tetras...
Something I originally overlooked... Angles and Guppies are a no-no. Most Angels will pull the fins off the male Guppies
In some instances it does work, but it's down to the personality of the Angel involved. The only way to find out if they'll pick on the Guppies for definite is to add them and hope for the best. 9 times out of 10 though, it ends badly 
Good luck finding the Pterophyllum leopoldi. I have only seen them once, and they were about £50 a specimen...
All the best
Rabbut

Something I originally overlooked... Angles and Guppies are a no-no. Most Angels will pull the fins off the male Guppies


Good luck finding the Pterophyllum leopoldi. I have only seen them once, and they were about £50 a specimen...
All the best
Rabbut