angelfish tankmates

I have kept my 2 angelfish (not breeding) with albino 4 albino corydoras in a 55 gallon tank and the tank is a little dull. I was wondering if I could add a electric blue acara. I have kept the fish for about 1 month.

hi! i have a tiger oscar ( not agresive) in a 300 gallon and want to add some angelfish (around 16 adults ) to the tank, but not sure if that is possible. the 300 gallon tank has a lot of hiding spots and has very good filtration( capable of supporting a 2000 gallon) any thoughts on this