today when i was changing the water in my snappers set up i had him on his back rinsing him off with water he had his tail curled up under his shell (he has about a 4 inch shell length) and i noticed the last 1/4 inch or so was broken off and was stuck in a fold of skin where he pulled his legs in, i change his water every other day, he is kept in a 58 quart rubbermaid container but soon to be put into a 6 foot diameter kiddy pool, he eats very well in fact becoming a porker, he gets a small crawfish 1 time a week i keep feeder guppies and rosy red in at all times and have seen him nibble the plants i have in the setup i have even seen him nip at the cuttle bone i put in for calcium. so my question is am i doing something wrong, did the crawfish pinch the tail possibly even though i chose 1 with very small pinchers, or did he bite his own tail, thank you in advance for any help on this question

