Being around all types of art, I tend to stop by the glass blowing students, as I adore they're amazing talents. I tend to get free practice glass pieces. Not perfect, but lovely all in the same. I was wondering if such would be safe to put in tanks? Would they just shatter with the water pressure? Or act like anything else? I think they would be lovely little ornaments if they'd work. As some provide tunnels and such. Anyone ever used them in there tanks?