Manacapuru angelfish are a wild strain that grow much, much larger than standard angels and develop nice brown shoulders.  It's Pterophyllum scalare, not P. altum.  I have too many in the tank, so some have to go.  Will readily interbreed with standard angels to improve vigor, body shape, red eye, etc.  Purchased from Dan's Fish for $125 (see link), my loss is your gain.