When do I feed my beardie less crickets?

Hello, I have two bearded dragons, they are around the same age, but one is growing RAPIDLY over the other one, the other one is still only 6 inches, and the bigger one is atleast 12 inches now. They are seperated. I have had them both for about 4 months now, I got them from Petsmart so I'm unsure about how old they were when I got them. They are both in their own 20g tank, but I am upgrading them each to their own 55g tank this Friday. (I have the tanks and I would do it sooner but I'm moving on Friday, pointless to set it up now.) I feed them each about 20 crickets a day. What I want to know is when do I start feeding them less crickets? I also feed them veggies every day and they eat that as well. I stir in calcium powder in the veggies as well as coat the crickets.