Yeah, definitely in a funny way!
Chex (my choco guy who I have had a near impossible time naming--Chex being an amalgam of Ch- from Chip and -ex from Tex) always does this funny thing where he'll aggro out if you're a certain distance, but the closer you get, he backs off kinda like, "Hey man, you wanna start something?!....Whoa, Whoa, let's see if we can hug this out!"
Prince (the "violet" HM I was going to return) circles the area I drop his food like a hyperactive shark whenever I get near.
Dink, who was off in a corner and too stressed to do anything when I got him, just kinda cruises around, and will put his face up on the glass even when you do the same, but if you point a finger at him, he'll swim up and to the side, almost saying, "Boy, don't you poke that finger at me..."
all hilarious little fish, all either unwanted by others or wasn't sure if I wanted to keep them. Glad I did!
If it is an aesthetic decision based on your office, 2 fish works better than 1 IMO. Lots you can do with symmetry and juxtaposition.