One has sequins all along the dorsal fin and the other one has only at the end (back) of the fin.
The videos were filmed just a few minutes after the fish get into the tank so their colors faded from the scare.
Last night, the one without the sequins all along the dorsal fin has made his whole face and fins super red.
This one is also has all well ahead of the fin painted in black.
Another thing I'm not sure if related but one of them casting tube facing forward and the other one backward
What kind of pictures to shoot and upload so you can help me distinguish certain?