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Proper Fish Friendly Silicone

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GE Silicone I (without mold inhibitors) is fine to use. Can be found at Home Depot / Lowes. I will say that over time, the silicone becomes milky white. Not sure if the comparable Aqueon silicone sealant stays clear over time, but it generally cost 2x more. 

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Here's another as well.  I know the HD in Sterling stocked it about 3 years ago when I used a 40b to make a DIY sump, but haven't looked recently:




Package specifically states 100% silicone that is safe for aquarium use and it worked fine for me.

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