We have had this boy from little, so we figure he's about 17. He just seems disinterested in eating & maybe even lethargic currently. Always been a solid striker, last feed attempt he didn't really attempt a strike, hardly even a body squeeze, then he just sort of circled around & I noticed that it was like he could't open his mouth, sort of rubbing it on habitat, a little like when he sheds. Any suggestions? Is it just old age?? He has eaten 3 tidbits since last winter's rest.