If you're not planning on making worms the staple diet of your rays then why not just buy a pound or two of worms and culture them in a DIY worm box. I think this would be best given your situation. No need to keep them in the fridge. Just keep em alive! Btw, I think the european nightcrawlers are more common in your area
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Oops sorry op doesnt want to breed em. Lol. Just keep em alive in a bucket full of dirt
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