Crab barely moves his legs

[Kheyg Kharra]

I was cleaning enclosure of my Cardisoma Armatum and noticed he's not really moving. Most of the times he would try to run away with his claws upright. But today... he's just sitting in his moss bed. I picked him up and he's not really moving his legs, pinched me though. When I put him back..he just fell on his face. Also noticed his eyes weren't upright as always. Is he sick or does it mean he's gonna moult soon?

 

[Ratmosphere]

@dragonfire1577