They are growing fast ……….
Different sizes – different age?
For me again it’s a prominent character in quindecim: The shining pearl-white of the broad eye rim. I know too few paro species from my own experience to decide whether it’s a feature unique in quindecim, but those I know (nagyi, pahuensis, unidentified females) definitely don’t show this feature, their eye rim is only partially white. If it’s unique in quindecim, then it makes a reliable determination of females and even fry of quindecim among other species possible.
In practice it made it very easy for me to separate the quindecim female from the other females, when it accidentally got into the wrong tank.