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here is a product i found that i use on all my vivs. its just like GS but is black and is for constructing waterfalls for ponds. i found this product at UBS lumberyard or you can find it at their website at Touch-n-Foam insulating sealants - energy savings foam insulation - spray foam insulation. this product is nice because it is black so if you miss a spot with the black silicone you dont see any white GS showing and you also dont have to smear the glass first with silicone if you dont like to see the white GS showing through. Tetra also makes one but it is a little more expensive. i got this product for around 5 bucks a can and it is fish safe and wont dis-color.
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