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[AGA Member] DIY yeast bottle cap glue toxicity?

How important is trace toxicity from glue securing airline barbs in the caps of DIY yeast bottles?
I had several combined factors that may have killed 4 of my bigger fish, such as pH and heater/room temp overheating, but also using a different glue on the bottle caps for the new yeast batch.
I'd been using silicon before. The odd thing is, puttin the new caps on a different tank, fish are fine.
I let the Outdoor Goop for 5 days, but it still had a very faint plasticky odor. In a previous experiment with it on the same tank, I'd let it outgas for more than 2 weeks, to no obvious ill effects. My sister commented that Outdoor Goop is really toxic, she thought there were warnings to parents about not letting children get hold of it at any time. It isn't the same as the regular indoor Goop.
Goop was recommended on one of the other aquarium CO2 lists, but without specifying which type of Goop. It does hold the stem and cap together really well. Normally I'd prefer the silicon, but over several months I found silicon is not adhering to the plastic of the bottle caps well enough to hold up when I'm banging bottles about underneath the tank (as carefully as possible, but still!).
Should I try gluing the next batch of bottle caps wiht it and let it air longer, or give up and go back to silicon? Silicon isn't nearly as secure or solidly attached to the plastic.
I was also wondering if I could get away with gluing the silicon first, then layering Outdoor Goop over it only on the outside, or if I should go buy the regular Goop (not outdoor), or if I should do the silicon then layering with the regular Goop.

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