Angels are one of my favorite fish. I think you should be fine with three. Also, full grown angels should be fine with full grown cardinal tetras. If you like the look of neons, then try cardinals with the angels.
If i were you, I would have
3 angels
2 schools of 10 small fish like tetras,rasboras,danios, or dwarf rainbows. (personally i would go with dwarf rainbows like kristin said and cardinal tetra)
6-10 corys (keep to one specesies though!)
It would not be heavily stocked, so you could do bi-weekly waterchanges.
I also suggest getting a test kit for ammonia, nitrite, and nitrate if you dont have one so you can know how you tank is doing inbetween watervchanges so you can get a schedule set up, and also make sure you done go into a mini cycle!
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