larval spring salamanders floating after eating a large amount

PDONTnAMBY

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I'll try to keep this brief. Hopefully the pictures are helpful, but if better-lit pictures or a video of their behavior would be helpful let me know.
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Two CB spring salamander larvae I purchased from a user here last spring are floating, head-upward and right-side-up to sideways (see pictures). Both received large meals of frozen bloodworms I think two days ago (Tuesday 2-Feb) and then received a medium-sized meal of frozen bloodworms yesterday.
For the time that I've had them they've been kept alone in roughly two-gallon shoeboxes. They do not appear to have generalized swelling or tissue edema, and to my very untrained eye their gills and viscera look normal (aside from a lot of partially-digested food and poop). While they're generally floating pretty still, they do occasionally try to swim to the bottom and they were active and responsive when I moved their containers.
  • They do not have any substrate or, I believe, anything else in their containers that they could swallow to cause impaction.
  • Their diet consists of frozen bloodworms, earthworms, and locally-sourced scuds (though of late it has been heavily biased toward frozen bloodworms). They are generally fed every third day or every other day; it was an unusual (and looking back, questionable) decision to feed them two days in a row.
  • Their water is bottled spring water (which I've confirmed from the supplier is in fact directly from a spring and not chlorinated or anything), with about 25% changes weekly and regular top-offs of evaporated water with distilled. I don't have any water testing kits available at the moment, and I've not had any issues with water quality to date, but to be safe I replaced about 25% of their water with water from other tanks whose animals are thriving.
  • Their water is aerated through an air hose without a bubble stone. I did notice that the air hose in each of their containers was submerged but not producing visible bubbles; is it possible that it could have instead been supersaturating the water with oxygen? That doesn't seem likely but I'm hardly an expert on fluid dynamics.
Right now I have their containers on the ledge of my cracked-open window, which with 36° air temp should be about perfect fridging temp. The air hoses are out; given the air temp and the fact that their containers have air holes in the lids, I'm not worried about under-aeration being an issue.

Beyond this makeshift "fridging," is there anything else that I can and should do for them? Thanks for any help you can offer!
 

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Happy update: Both sals are back to their normal bottom-dwelling, right-side-up selves. Neither has, ahem, eliminated yet, but they both look like they will soon.
 
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