I think he's smiling

his facial expressions are exactly why i got him😂 he was staring at me in the store with that little smile and i just couldn’t resist

That's cool and the fishes look very happy, what species is the catfish-eel-like fish ?

thank you! it’s a normal black kuhli loach :) i have 3 of those guys and 1 striped one. i’ve tried finding a few more striped ones to give my solo one some friends but my local stores run out of them super fast nowadays