The following pictures will show atleast some of basic differences (however some maybe a bit trivial)....
The seocnd photo is that of an Orinoco angelfish with the opercular spot (behind the eyes). It is also known as the mood spot and is assumed to be a means of communication among fish of the same species, others claim it only appears when the fish is aroused (whatever that means but i believe more of dominance indicator). For P. altum, the spot is a revert d shape while that of P. scalare consist of two crescent forms of darkening behind the eye.
Take note too of the difference in color of the fishes. Most report that in wild-caught P. scalare, there is lost of the bluish iridescence after a while in captivity. The lost is presumed to be due to environmental factors.
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