ok, whole story. 11 months into the 1st year. i started out trying to catch the mantis[turns out i have 2]finally gave up and deceided to leave almost everything alone, crabs and all.well after about 2-3 months both peppermint shrimp dissappeared. figured they were mantis food.tonight at feeding, both shrimp are out! where the heck they were hiding is beyond me.so, as of now i still have not found any real damage caused by the mantis.. they do get fed on a stick tho.