I would say 6 x 2 x2 is minimum for an oscar, they are big and chunky and need some space.
Im personally not a big fan of most cichlids, have never kept them and the ones i like are too big for my 70. I would go with
Stanzzzz7
and say that tanks with a group of a species are much more interesting
Im personally not a big fan of most cichlids, have never kept them and the ones i like are too big for my 70. I would go with