So I have a really odd question. Yesterday I was talking to some of my friends and we got to talking about fish; one of my friends said she's thought about setting up a tank with no fish but just a lego sculpture in it. Whether she does it or not is another matter completely, but it got me thinking. Could one make a lego cave or something of the like and then seal it like crazy with clear silicon, with a bit more around the sharp edges and corners to prevent fins from getting torn? I've never worked with silicon, so I'm not sure how that would go. I'd love to hear any input y'all may have!