Ashy Geckos growing.

My baby Ashy Geckos that hatched in December are doing well. I am still feeding them friut flies. When can I transtion them to crickets? Also how do I grow a friut fly culture myself? I tried making my own fly food out of instant mashed potatoes and a small amount of honey. I don't see any maggots at all. The adults i put in the vile a fine, but they are not reproducing.
 
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