We'll she looks to be a female, but dont get me wrong, many male fh show the black pearling on the dorsal too... if it is a female don't expect her to have a high chance of the kok getting bigger, if she lays eggs get her a male asap because that's a very nice female bro ! SB take a bit more time to get bigger then your average FH... so no worries on her growth process...give her about a month or 2 to get up to size.... Great pick up by the way !