Angels eventually get up to 6inches top-to-bottom, ideally a tank of 18inches or above in height would be good.
If the Tetras are small they may be at risk when Angels get fully grown.
> 'Bolivian Rams', 'Kribensis/Kribs' and 'Keyhole' are some ideas for smaller Cichlids.
RedHoney Gourami may be an idea...