oops, sorry , didnt see this until now. they are each about 4" in a 55 gallon tank. i'm going to soon upgrade to a 240 gallon.
from what i've read, they appear to be monos.. they have the three main black bars with the former stripe going through (stripe now reduced to some black markings, with a large portion of the stripe on the tail) with the high contrast borders (looks yellow sometimes.. so beautiful) and the colorless eyes.