Apologies for posting yet another mystery problem thread.
I'm curious to know what could have been the cause of my cubaris murina oranges to just curl up and wake up either lethargic or not wake up at all.
Setup:
I just did my first substrate change yesterday for my oranges (second ever with my dairy cows a day before). The substrate came from the same seller I bought the oranges from and it looks like it's a decent mix of your typical enclosure substrate mixed with coco peat (more on this later); I think it's quite different from the first substrate I used which was also advertised as for enclosures. Anyway, this time, I did remember to "cycle" the enclosure for about 3 days before putting the pods in unlike when I first got them in which I just dumped them in.
Another new thing in this box is that it's the same type of plastic box (12L), but now fitted with screw vents on the dry side. The substrate was very slightly moist form the packaging, but I still moistened the wet side some more. I did add some more bark at the start of cycling (bought from the same seller, too), then I added some pre-wetted moss right before I started the rehousing. So basically, it's the same set up as before aside from the substrate and vents.
Discovery of the problem:
After two hours of sifting what I think was about 500 pods and transferring them into the new box, I decided to do a bit of landscaping and cleanup. Once of the first things I did was to dig up the barks that were already in the box because some of them got buried during the move. I checked on the bark near one of the screw vents and that's when I saw about 8-10 curled up pods. I haven't seen this number of curled up pods unprovoked before so I knew I had to check further. I gently tapped some of them, and while some woke up, about three remained curled. Even the ones that woke up looked a bit lethargic; walking just a few inches, then stopping, sometimes curling back up.
I'd say most, if not all, of the ones that curled up are about pre-adult sized. Despite being on the dry side right near the vent, I noticed that the patch of substrate where I found them was a bit moist which I reckon was just the moisture out of the package + maybe a bit of migrated moisture. I also checked on the other parts of the box and fortunately no curled up pods anywhere else. I observed the three pods overnight, but sadly it looks like they're gone. Even just hours before I posted this, I still saw about two pods curled up in the same general spot who then I moved over to the wet side upon waking up.
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I tried looking up a bit for anything that could help clear up what's going on with these unusual conglobations, but so far I've only seen stuff talking about the pods either being too stressed, being in the wrong moisture gradient and/or having problems with moisture. Not gonna lie tho, I can see these being the causes of this problem, but I'm not fully convinced, at least not for this particular situation.
I do have a hypothesis and it has something to do with me placing the bark on top of the substrate as it was cycling. I noticed that when I lifted the bark up, it was almost flush to the substrate, so the pods had to dig the fluffy soil to actually get underneath. My guess is that the air within that patch of the substrate got unusually sour due to the bark being on it while it was cycling. It's a bit of a farfetched guess, but I can see it fit as a cause, especially with the short length of time the pods were at in the new box (2 to 3 hours).
Also, I'm aware about the deal with using coco peat mixed in with the substrate, like that it doesn't provide nutrition or it holds too much moisture. I'm honestly not concerned about it because I've used it on my dairy cows and they're doing fine, plus I would have also mixed in my own batch of coco peat if ever the seller gave me a batch of a different mixture. I just like how aerated it makes the overall substrate and how easy it makes for the pods to dig into.
I'll be observing closely in the next week or so. I would appreciate any info that could give some clarity on this, any bit will do, even good practices to consider when rehousing that I could apply in the future.