Angels and their tankmates

I agree with what's been said above.
In my experience, the more Angels in the group, the better. At least 5+. That way, one is less likely to be picked on. And there are enough to form a pecking order. There could well be a bit of squabbling among themselves, but it generally harmless. Someonetimes when a pair tries to breed, they do get a bit agro. But my Plecs take care of the eggs at night unfortunately, so the parents soon calm down.

As for tank mates.
The smaller Tetras are definately at risk.
But Congos are nice, as are Bleeding Hearts.
I had Thick Lipped Gouramis too which are quite placid. (Tried Pearls, but they nipped the Angels fins so I got rid of them).
Aslo, some of the oddballs if you like them. Bush Fish, Glass Cats, Knife Fish, all should be ok.