I have had my crayfish for a little over a year. 2 weeks ago he molted for About the fourth time. He did not eat his exoskeleton and now he will not eat anything. He mostly stays in one spot but he won't eat. We think maybe he can't eat. He is in a 10 gallon tank. He is slowly dying of starvation and I don't know what to do. We used to check his water and it was always fine and then we stopped so could this be caused by his water? We could check his water if needed. Is it also possible that that he is just dying of old age? He was someone's classroom pet and was given to us so we don't know the age of when we got him but he was pretty small.