I have consolidated my reef tanks into one, leaving me with an empty 12 gallon Nano Cube. I don't want to do anymore coral, but I would like to have an interesting fish / animal of some sort to have on my nightstand. I thought about maybe a snowflake eel, or a scorpion fish, but I'm not sure if the tank will be too small for them even if they were the only occupant. Can anyone else suggest something more than just an ordinary fish for my cube? Thanks.