Well, I ordered a replacement pane of glass for my 200g tank yesterday. It is the side piece that is 34x26 and 1/2" thick. I want to use the best possible sealant because 200 gallons of water on the floor would not be fun. I plan on doing a test for about a week outside first. I have been reading up on different silicone types. All seem to very similar(WITHOUT MILDEW ADDITIVES) I like what I've read about NuFlex 333, but it states on their website for use under 100g. I want black to match the other seams. Also how much should I buy for this size glass repair? Here is the types I've looked into:
Best silicone/sealant for large tank
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