Stumbled upon this thread about what silicone is safe to use for aquariums. I lived in Canada for 10+ years now but i never needed silicone for my tanks, until now when i have to rebuild one. Wow!! there is no silicone in north america made specifically for aquarium use. I would not chance it with using one of these ge or dap or whatever else silicone that was made for totally different applications. It is not just if it is safe for fish or if it has mildew resistance or something else, it is also about its tensile strength and peeling strength. I will go ahead and get Den Braven Aquarium silicone, it is what i always used in Europe and it never failed. No emails or phone calls to the producers or anything, it is silicone made specifically for building aquariums and nothing else, not for construction, windows or doors. It can be found on amazon.