I would feed him as many as he wants. Add in some crickets, roaches, silk worms. Variety is good. Mealworms are hard to digest so just a few. Avoid waxworms as they are very fatty and not a good food even though they love them. Curly wing flys and fruit flys are perhaps a bit small but the little ones spend hours catching them. It's been a long time since I had veileds and I wasn't educated in fruit and veg so hopefully someone will help with that.