Leafy greens, like mustard, turnip, dandelion, and collard greens. Brightly colored veggies can be thrown in to help entice him to eat the salad, too. Here is a great list of foods: http://www.beautifuldragons.com/Nutrition.html
TWO MEALS of LIVE HIGH QUALITY INSECTS PER DAY --- MANDATORY ....
Good feeder insects for a 6 month old juvenile who is growing FAST !!! are
>>>>> large BSF maggots
>>>>> medium (2in) silkworms
>>>>> 1/3 to 2/3 size gutloaded calcium dusted crickets (or similar sized roaches or locusts).
off leafy high calcium greens and chopper / grate veg daily but don't obscess if he doesn't eat them at 6 months old , much more important that he gets LOTS of high quality insect protein.