Cichlid ism
Aquarium Advice FINatic
Nice looking tank!
Honestly for a pair of oscars you will want a pretty big tank. 200 gallon would be ideal.
200g for 2 O's!? I guess that means you need 55g for a single neon.
A 120+ would be ideal for 2 O's. that 5'x18"
With that said you could also add some other fish. Cats/plecs. Or school of targets.
Hey.....who wouldn't want a 200 gallon tank?