Ya, looks like shell rot, try to isolate the mantis. Once isolated, keep your water quality high and encourage a molt. I have had this before in the mantis I had, once it molts, remove the exoskeleton as quickly as possible. I think this is the only way to fix the problem. Just my thoughts on it, hope it helps.
Bob
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There's plenty of room for all God's creatures.
Right next to the mashed potatoes.
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