You said you weren't sure of the size?
Well most species only get to 6cm don't they? Someone can correct me if I am wrong, but thats what I have seen. So they are small fish.
But somehow (who knows what they've been fed! lol) there is a pair in the planted display tank at the LFS here, and the male is 10cm long. Can't pull the name off the top of my head, but its the bright yellow type with red spots. Hes gorgeous, but again, you only see him half of the time.
Like alanmin said though, if you have enough in the tank, there will always be some visible