Bad news unfortunately. My new began acting well again as stated, but on and off. Once or twice he went back to "cupping his legs" together and wouldn't move them. Then he shed his skin twice in less than 2 weeks. He was eating but only now and then. He seemed fine, and today I got up and saw him hanging out on his leaf and figured nothing of it. I went back about an hour ago to check on the tank temp and noticed he had not moved and in fact had died. We had him for about 6 years now so it really sucks but I just don't know what happened.
He was bloated when I found him dead, had a pale colour to his skin (I noticed the paleness a few days ago too and thought he was just dehydrated so I wet him down on his island and turned the light off), and green splotches visible on his sides (maybe from dying). Parts of his skin were sluffing off (small peices like shedding), and his mouth was swollen up.
Is this some kind of sickness or did he die naturally from old age maybe and this was just from sitting in a tank all day? I have another newt in there and worry she may get sick next. They ate tubifex freeze dried cubes and always have without issue, the tank is kept clean and filters changed regularely. No chlorinated water is used and temps are moderated properly. We've had them for 6 or so years and I'm sure if we were doing something "wrong" it would have showed up a long time ago. He will be missed.