I'd be willing to say that it's more than likely male, the dorsal filament is just too prominent for a female as far as I'm concerned. Though as a single specimen, gender shouldn't matter too much - it's just helpful if down the track you want to try your hand at pairing (which tends to not go so well anyway).
They can still get Cryptocaryon, it's just the trophonts don't/can't attach to their skin as readily - all the other stages it's still at risk of befalling ;)