looks like a nice little silver you got there Jrp .
they do go super fast for the first 6 months or so mine went from 5.5 inch to 13 or 14 in about 5 months from june to november .
then seemed to slow down some ,although they defiantly are still growing . maybe starting to grow out more now then length . up to about 16 inch or so now for the biggest .
the last three months being slowed down a good bit it seems . still i have four months till i will have owned them a year so we will see just how big they are by then . iv kept mine at around 82 f this whole time and fed them very very well lol