I lost a few thousand mealworms that way. The fridge got to cold, iced,then thawed and mold formed killing everything. Its easier to allow the mealworms to pupate and begin a breeding colony of your own. There are tons of sites out there about how to care for them, gutload mixes etc.
My setup is like this: I have bins with tops for the beetles (there are holes in the top). For the baby mealworms i have a few huge bins, for the mealworms i feed i have those plastic drawer units and i've separated the mealworms into groups depending on who i'm feeding them to. The worms i feed to the two geckos i believe are gravid are fed more calcium, minerals and vitamins.
Once i find the pupated worms i place them into a holding container until they turn into beetles. From there they go into the beetle box. Every two weeks or so, i switch the beetles from one box to another with new bedding and dump out the old bedding into the baby worm box. The baby worms are very hard to see, usually after stirring up the box i can see the bedding moving, thats the worms.
Hope that helps
Red
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Crested Gecko Zeek:1.0, Ziggy and Zeus
LEOS: Boo: 1.0 normal , Bronx & Nala: 1.1 blizzard,
Lily: 0.1 patternless, Abby: 0.1 albino, Zoe: 0.1 reduced pattern, Dot: 0.1 hypo
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Chip: 1.0 papillion (small dog)