You have a point there. This is why we have eschewed the type made for bathrooms and sink caulking in the past. I've used it recently on some new tanks. The recent product does say it inhibits mold when cured by "Bioseal" technology. It doesn't however say what this is, and has no list of ingredients other than 100% Silicone. I know this has been discussed on Dendroboard, as well, but I haven't read any absolute conclusions about whether it contains arsenic compounds. I should think they would be required to list this if it does.

In any event, I haven't yet heard of anyone having problems with it to date. One does need to let it cure before introducing animals and plants--if "cure" is even the right word, because there are fumes produced. Usually at least 72 hours is what is generally recommended.

There is a so-called "aquarium safe" silicone product that one can find at pet stores, but this is really expensive, and the only stuff I ever found was in a smallish squeeze tube rather than a caulk gun tube, was difficult to work with, and didn't go very far.

As far as I know, everyone is still using the GEI, or a comparable DAP product.
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Patty
Pahsimeroi, Idaho

Dendrobates: auratus blue, auratus Ancon Hill, tinctorius azureus, leucomelas. Phyllobates: vittatus, terribilis, lugubris. Epipedobates: anthonyi tricolor pasaje. Ranitomeya fantastica, imitator, reticulata. Adelphobates castaneoticus, galactonotus. Oophagia pumilio Bastimentos. (updated systematic nomenclature)

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