well if you want to feed mealies as a treat only.. i would wait until he is a year old or the mealie is smaller than the space inbetween his eyes.. i do not feed mealies to my bearded dragons.. i have fed spike a few but only when sees me feeding the leos and water dragons mealies and then i drop in a few for a treat.. but other than that my beardies don't get them... i treat mealies the same way i treat waxies..treats only.. if you want an alternative to mealies once he's an adult you can feed superworms .. but not as a staple.. i feed my adult beardies (over 16 months old) superworms every three days along with silkies or crix and pellets and a salad everyday...and silkies are a great staple. they are very high in calcium..but tend to be more exspensive.
alissa
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2.2 chinese water dragons
1.2 bearded dragons
0.2.1 leopard geckos
1 african clawed frog, 1 african dwarf frog, 1 california newt
1.4 english setters
2.2 breeder mice
tons of fish