a tang truelly shouldnt be in any tank less then 6' in lenght, they need lenght not width or height, ive broken the tang rule several times myself, ive always gotten them small, yellows, hippo's, clown, mimic, all usually around 1-3" takes about 3 months before i am netting them and getting rid of them, really have my eye on a 2" edible mimic at my lfs, but i know the routine few months later i am tearing tank apart to catch it, i dont really have a nano a 60g cube, funny part most people comment a tank isnt big enough or debate it, but is the tank a reflection of the type of area it came from ? is it a cliff dweller ? high light ? low light ? temp ? size of tank shouldnt be the only concern people have, diet as well