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Originally Posted by nanoreefnewbie
Nothing 100% sure on brand but said water proof it wasn't....and it was a new addition added last nite too off tonight too rebuild with different silaconed I guess
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Don't use GE Silicone I or II, they may say 100% silicone but also have mildew inhibators that can kill your tank mates. There are silicones made specifically for aquariums, some much cheaper than others, but I can't recall the name right now. I know Grizz uses it, maybe he'll refresh my memory.