I never tried any of the silicone from those stores. Since you're in Canada, you can get safe silicone at Canadian Tire. I buy the Mastercraft brand silicone with a green/aqua label. It even says 'ideal for aquariums' on the label. It's also a lot cheaper than the GE silicone and most other brands I've seen. I use it on all the tanks and enclosure for my geckos, chams and dart frogs, never had a problem in over 10 years of using it.
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