Yes, they turn to flies in about 10-14 day mark depending on what size you order them from. You can feed the flies to your beardie though. The flies are slow, they don't have a mouth so if they escape, they won't live long as they will starve to death. The flies are a little less nutritious as the larvae but just as good to go. When mine turn to flies, I place the container in the freezer, wait 10 min, and they are all dead.
You can also slow their growth if they are placed in a wine cooler. Do not refrigerate.
Roaches are easy to care for. A plastic bin, egg crates/toilet paper rolls, water crystals and food. I use fish flakes plus some fruits and veggies. They do best somewhere dark and prefer to be left alone. Room temp works but some people have better success with adding some heat. I don't use any heat for my discoids (Similar care but a tad more challenging to raise than Dubias. Dubias are not allowed in FL if you are from FL).
That is good with what you are feeding. As long as he gets about 25 live insects per week, that will work.
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