hi mr. fish,
I don't think the angels will feel well in a 40gal-tank when they get bigger... remember, they can get as high as 10" _if_you_let_them_.
they need some space to move up and down, and normally in a 40gal, height is not sufficient (at least not with the standard measures I think of).
and yes, I think bossing is normal. these guys are pretty *naughty* in behaviour, if you're unlucky you got two males, and one now bosses the other one around. which is really not cool at all for the other one.
regards,
silvia