Tie between my Threadfin Rainbows (they are not common here and I had to get half one time, half about 3 months later) which I love to watch interact with each other (the males "flare"), and my remaining Marble Lyretail Molly. She is the soul surviving fry from Big Mama, my first and longest living Molly (the fish that survived all the newbie mistakes). She looks just like her momma too, except not as large (she was Big Mama for a reason). She's keeping the Molly Legacy alive for now until I have room for more tanks and a new batch of mollies.