10-15? Bearded dragons grow until there around 1.5 years so they need the extra protein. You should feed him as many crickets as he will eat in 15 mins 2 times a day. While also offering greens daily. That's why I went to roaches they don't smell and I can put them in a dish for my female to eat when she wants and just add more as the day goes on. Don't forget you should change his uv bulb every 6 months( I hope your using a reptisun 10.0) and make sure his basking site is at least 105-115. And dust his crickets 3-5 times a week with cacium and 2-3 times a week with a multi vit(on different days). And give him a soak 1-3 times a week
if you have any questions you can pm me( I use to breed bearded dragons)
Tom