im not sure if this goes here but anyway what does it mean when meal worms start to change color from a whitish to having a brown thing starting to envelope it

I believe its when it sheds the exoskeleton and starts the stage of turning in to a beetle.

This caresheet has some information about it.

http://reptileguides.herpcenter.com/...-t31.html?t=31

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MARSHA

:D I'm smiling because I have no idea whats going on!

Mealworms are naturally tan colored. They will be white immediately following a shed of their exoskeleton. It is at this time they are softest.

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Merlin,
What's Life Without A Little Magic!

It seems to be the time they are the most tasty, too. When I'd feed them to my water dragon, he'd go for the newly shedded ones first. Maybe just because they were soft. Who knows?

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well it doesnt move unless it is touched and seems to harder than normal

If it looks neither like a worm or a beetle than its a pupae. The worm is metmorphosing into its adult beetle stage.

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Merlin,
What's Life Without A Little Magic!