I have a twenty gallon with a white crawfish and he's had shell rot for awhile which I was treating with salt baths and for awhile it had worked but now it has gotten real severe his claws are almost entirely black and he's officially refusing to eat his favorite food, he used to be very active in the tank and now his activity is at a minimum Is there any other treatment I can give him or is it time to say goodbye to him and deep clean the tank. I did have a blue crawfish living with him but he has since been removed and put in a ten gallon so I can keep watch of any signs of shell rot on him. To be honest I know a lot can cause shell rot his water conditions were fine, he hasn't been stressed I just noticed the spots appearing one day and I am still unsure of the reason why. Unless anyone has any suggestions on any other treatment I can give him I'll need to find a quick way to put him down he's been with me since the loss of my first crawfish Opie last year and it is shocking how quickly the shell rot progressed even with the salt baths. If no one has any other recommendations then what I've been doing then tomorrow I guess I'll stick him in the freezer and do a deep clean of the tank. please reply as soon as you can to this post.