Old Male Twitching

[Hagraven]

I have cared for Dinin, my old Chilobrachys Huahini male for several months now- he's been in good health, eating and webbing. He came into my life already an old specimen and I know he's not going to live forever.

Yesterday I caught him unexpectedly turn onto his side and twitch (please see video). Is this normal behavior for an elderly male t? Is this DKS? And please, if anyone has any suggestions as to how I can make him more comfortable I'd appreciate it. Thanks

 

[Hagraven]

^ I should also say that last Tuesday I rehoused Dinin- as well as another adult (she is however doing great). I used 70% cocofiber, 10% sphagnum moss, and 20% horticultural charcoal, roughly. I can't think of anything else that has changed in his environment/daily routine. Thanks again