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okay, well first off, a P. ciliata (which is what you have) cannot break glass. that isnt your problem.
crushed coral as a substrate isnt the best, aragonite is best imo.
I assume you have live rock and for it to use for a burrow? If not then that would explain a bit about the mantis' condition (which is you main problem). are the black spots along its back just debris or are they actually in the mantis' carapace? this could be shell disease. see those little tufts of green along its back? If that's algae that is growing off the mantis, then there's a big problem. You need to black out that tank, feed enriched food every day, and keep pristine water quality while not even looking at the mantis until it (hopefully) molts. otherwise it's a goner. let it go too far and the algae rhizomes (algal root structure) will penetrate the carapace and not allow the animal to molt. this will kill it.
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