Try putting the mealies in his Veg, it may encourage him to eat the veg. As he's only 6/7 months old it's not a big problem it only becomes a problem when they are adults and they are meant to eat more veg.. Which if it carries on my vet advised me to stop feeding my beardie live food and just give him the veg option and it does work you just have to be strong and think it's for the best. But honestly i wouldn't worry about the lack of veg eating too much yet....
1.0.0 Bearded Dragon Called 'Che'
0.2.0 Leopard Gecko's That have no names... Just know as 'The Girls'
0.1.0 Normal Ball Python Called 'Amica'
1.0.0 BEL (Super Fire) Called 'Heisenberg'