@Klyde O'Scope, my apologies - I completely missed your comment. I am only using 100% Clear Silicone 1 in his new enclosure. The aquarium silicone was on back order online (!!) and local shops were sold out, so I got the GE and Loctite products without the moldicide or anti-mildew additives. (If this sounds wrong, let me know and I'll correct it. Anything for my little dude.) It's been "curing" for 3 weeks and the vinegar smell was gone within a few days.
As a random aside, thank you all for being on this forum. Already the amount of knowledge and assistance I've found just lurking on the forum has helped my little guy more than you know.
EDIT: Adding pics and links
1. Loctite Clear Silicone (says "Aquarium Safe" in the fine print)
https://www.lowes.com/pd/LOCTITE-3-...VnB-tBh3gFQS0EAQYFSABEgIBLPD_BwE&gclsrc=aw.ds
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2. GE 100% Clear Silicone 1 (not for use in aquariums but "compliant for incidental food contact")
https://www.gesealants.com/Products/All-Purpose-Silicone-1-Sealant?category=Caulks+&+Sealants&isProductDetail=true
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