I use to have a managuense that would fetch beers from the fridge and light up cigarettes...is that impressive?
I'm not really sure what you could define as the "smarter" species in aquariums. Several of my fish recognize when I walk in the room and come up for food, so that's nothing out of the norm. As far as personality goes, I use to have 2 large volitan lionfish that were quite interactive, however my opinion is that they were just food oriented.
Several of my catfish will readily take smelt out of hand hand and will allow themselves to be stroked, but I don't know how intelligent you could call that...
I'm not really sure what you could define as the "smarter" species in aquariums. Several of my fish recognize when I walk in the room and come up for food, so that's nothing out of the norm. As far as personality goes, I use to have 2 large volitan lionfish that were quite interactive, however my opinion is that they were just food oriented.

Several of my catfish will readily take smelt out of hand hand and will allow themselves to be stroked, but I don't know how intelligent you could call that...