The other day he was fighting floating to the top of his tank and floating on the ceiling of his cave (which he never goes in). His body had also gone a yucky orange-yellow colour. I changed his water on the spot (100%) and when I left for work he was floating at the top. I expected him dead by the time I returned.
I came home and he was swimming around again but the yellow tint remains. He's active but not himself and he's not even eating bloodworms.
Aquarium salt? Water imbalance? I don't know what I can do.