I was going to say my new festae pair, but I was thinking that if I could only keep one species of fish it would most likely be my fat sleeper gobies. They have so much personality.
I don't know why but I am in love with the Dimidiochromis compressiceps (eye biter). I love their body shape and jaw. The males when they get their color look sweet! I just got 3 adults from Repair today and I threw in a blood worm cube curiously and one took it down in one bite!