All GE silicone adhesive/caulk products contain mold/mildew inhibitors and have for years. The Kitchen and Bath marketed products in the GE2 family have more inhibitors than GE1 products.
GE2 is a 'low odor' curing product line and contains organotin curing agents, which are known endocrine disruptors. That's one reason non-acetic acid cure products are sometimes avoided for animal use. Those 'low odor' products also release ammonia when curing, which has been a problem for aquarium applications.
Non-aquarium marketed products tend to not have been tested for long term below-waterline durability, which might be another reason animal keepers might want to avoid them especially in high moisture enclosures.
I agree that 'aquarium safe' silicone adhesive is always the right choice for animal use, though.
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