It sounds like everything is ok. My male is about that age and always eats. He can sometimes go for about 2 weeks without a bowel movement, but when it's that long a nice soak with clean water and then I prep for the mother load... lol!

Maybe he's just getting bored with night crawlers? Try feeding him horned worms or dubias. How do you feed him? With tongs or do you let him chase his prey?