I'm sure you've heard but DO NOT stick the razor in between the panes of glass. Will ruin the whole tank. When you run your fingers along it you want to only feel glass.
I missed a spot, and when we went over it with the new stuff, it would not stay on, it repelled away from any dry silicone. So we just caked on a huge amount. Good thing it was on the bottom so you don't see it. xD
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