As beardies get older they should definitely be eating their veggies. I would say that he's possibly dehydrated. Good soaks will rehydrate him. But I'd start offering his veggies in morning and protein every other day in afternoon. The veggies are important to them living a long healthy life. I use that regemine on my colony of 7 and they all eat their veggies daily, and the prey insects every other day. Some times when they are over fed the protein they stop eating their veggies. You could play the waiting game and cutting him down on protein giving him veggies every day and when he starts eating his veggies start the protein back only in the pm.