GE Silicon 1 - clear (but its not a spray, its a tube)
It's the sealant reefers use on our aquariums and anything put in them.
It's 100% silicon with no additives.
There are others out there that make the same claims at 3-4x the price.
Just make sure you fully allow it to dry and cure before you place any living thing the enclosure.
It will give off very slight/mild VOCs during curing, which takes about 4-5 days (but I give it at least a week for safety).
After it cures I'm pretty sure you can eat it.
Marine fish and corals are SUPER sensitive to everything, and the cured GE has no effect on them.