I'm having trouble seeing the paw print but do see the others' markings. As I age I find it harder to focus on individual fast schoolers, & like you said some, fish hide too much to identify as more than 1 of "those" species unless they have marking, territory or behavior quirks. Often just biggest female or something.
I could tell my pangio semicinctas apart most times. 2 hung out in tall plants & were so mellow they didn't move when I reached in their tank. That freaked me out more than a few times...& them too when I touched them to make sure they weren't dead, lol. But they all had slightly different patterns & gender shapes too.
I have to admit I didn't remember this tank photo forum way, way down past, well, everything on AC I pay attention to...until I figured out where TTA's music thread is...How many years have I been on this board? Sheesh

But I did spend a lot of yesterday looking at your tanks Noodle...better late than never as they say

It was fun binge looking but 30 pages took a while...lol, I had to get take out Thai food for dinner...well, you were the excuse