So I have had this blue cray for about 3-4 weeks now he is a P. Alleni. He loves his tank roams around a lot but lately he found this spot in a log he likes and he hasn't come out. This afternoon I looked in the log and he was laying on his side like he was sleeping like human it didn't worry me much but then later this evening I looked again and he was laying completely upside down with his legs straight in the air sometimes he waved them back and forth slowly. I panicked and watched for about 30min to see if he was dead but eventually he just flipped himself over and went about roaming the tank. He flips over quite often but only in his log. Also he waves his arms back and forth when he sits still upright. I know quite a bit about crayfish, it all seemed very much like molting behavior until he laid on his back for quite sometime that's what worried me. Has anyone else had this problem? what do I do and what's wrong?