I collected my versicolor from the post box yesterday. Moved it into it's enclorure last night, and this morning noticed that it was curled up against the side of the tank. I touched, and it moved, so I thought nothing of it.

Came home this afternoon, and it was still curled up in the same position. When I touched it, it didn't move at all. So I prepared an ICU by cleaning out a pillbox, wetting some toilet paper with warm water and squeezing off the excess water then pressing the wad down into the bottom of the pillbox. When I transferred the sling into the ICU, it uncurled a bit, but curled up again when I placed it on the toilet paper,

I punched about 20 holes in the lid, but the container is quite misted up from the humidity. The sling does seem a little better though. It's still not moving, although I haven't disturbed it since, but it is not as curled up anymore.

Do versicolors respond well to ICU? Don't they need a lot of ventilation?

BTW, the sling was in perfect health when I took it out of the packaging. So I don't blame the seller at all.

I think my peat was too cold. It felt very cold when I took it out of the bucket I store it in. I put the enclosures (I got a G. pulchripes sling as well) in front of the panel heater, to combat the cold substrate. About 60cm from the heater. The pulchripes was doing fine this morning, so I doubt it was too hot. Both slings were against the glass on the side of the heater. I'm convinced it was the cold substrate. The pulchripes is obviously alot more hardy than the versicolor.

Anything else I can do? What do you guys think of my cold peat theory?

If I understand humidity correctly it does make sense that cold = less water molecules in the air = lower relative humidity.

I'm no avic expert but I take it these guys like both humidity and a little heat as slings?

I suggest you keep it in the ICU setup you have described until it molts. This is how I handled my A. avicularia sling.

I hope Onyx comes here ,he had a long fight with the same circumstance.

That long?

I moved it's empty enclosure right up against the heater to warm it up. (microwave is on the fritz) I was thinking I would move it back to it's enclosure once the peat had warmed up, and it is was looking better.

You don't agree with that?

Damn..

I had my orange mouth do the same thing on Wednesday.
I stuck him in icu until this morning when his abdomen was kinda deflated..
Then I knew he was dead.

He ate perfectly when i fed him on Saturday.

Cold substrate wouldnt do that to an avic. My 2 avic avics have survived for over a year now with no heating and a misting once every 3 months.
Current temp in my spider room must be around 15 degrees and they havent seen water in around 2 months. Both are still eating, moulting and doing well.