But the Angelfish would eat them..........No Oscar lol
I would say its fully stocked
I think even with the congo tetras you might be better going with say 10 neons/cardinals/rasboras instead as congos grow to about 3" and they may look quite big considering there would be 6
Most of your fish are like 3" might be nice to just change it up a bit
Thats the reason I opted for Congos - they get big enough to NOT be food for the Angels =P