Actually, the GS that I have on glass stuck MUCH better than what I had on silicone. The guy at home depot also told me that GS will stick to glass better than it will to silicone. The issue with putting it straight to the glass is how it looks from the outside. I just painted the outside of the glass where you could see it. I know you wanted to see the pics of the tank I did, and I haven't had time to fix the IMG codes yet, so I'll just give you a link to my photobucket album. I'll link directly to the build album, but feel free to look at the other pics as well, most of them are of my pets, though a few are of me, and I think there are some of a gorgeous beach here in WA. Here's the link:
froggsong/vives - Photobucket - Video and Image Hosting
I will try to get the pic links fixed in the post asap. If you have any questions after you look at the pics, just ask!