Ive been keeping mantis shrimps for years and ive never had one break any glass. Even my biggest peacock hitting my 32g full force isnt enough to crack it. I dont even have an acrylic bottom on the tank with my 13 inch zebra mantis and they are really known for cracking the bottom out of tanks when they build their burrows.
As far as shell rot goes peacocks are the only ones really prone to it due to the fact they are found down on the reef instead of on the reef flats and tide pools like most of the smaller ones. As long as you dont plan on running t5ho, hqi or high powered leds you should be fine.
The most effective and economical thing i found too feed my peacock were frozen foods and the occasional little live clam from superstore. They have to strike it to get it open just like a live crab.
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