So I got 6 pristella’s probably a little over a year ago… they came in really tiny, but all about the same size… in look closely at that tank today, I can still find all 6 but some are nearly twice the size, of the others all were f d equally… assuming the difference is the sexes… which are which??? Tried to get a picture, but this is a highly shaded tank, makes it challenging… best I got out of about a dozen attempts