I’m not sure what happened to him, we went on vacation for 3 days and came back and he was like this..just sitting on the sand leaning on his side, his legs and antenna look shriveled up or injured? Water parameters are good? He is still eating, moving his legs and arms but it’s more like twitching? But when I fed him he perched up and ate then just laid back down?? Is there anything I could do to help him?