I have A female Dalmatian Molly named Perdita. Anytime I walk over to the tank she comes and greets me while all the other fish go about their business.
I also have a crown tailed betta named Benevolio. When I walk into the room he waits by the side of the tank until I come say hello to him. I think he's lonely because he's by himself, but he's kind of a jerk when it comes to other fish. He also recognizes my I phone and will stay really still for me when I take pictures of him. (Maybe it's my wishful thinking, but I think he's posing.