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Do you thin that a full grown Mantis shrimp can break 1/4 inch glass I was told that the force of impact from those hammers is like being shot with a 22 caliber hand gun and it hurt like hell
Yeah they potentially could if they wanted to, they have a hard hit, but I doubt they would have any reason to hit the glass at full pelt. The bottom of the tank could be a target as they burrow so one may get to the bottom and try hit it, but again in all likely-hood they won't but it is a risk, even if one can't break the glass in one shot, it would crack.