I've got a tube of Mr. Stickey's Underwater Glue that says it is fish safe, but the wording makes it sound like they're not really sure. Apparently it's "minnow-safe" and that's the best they'll say. I've used it to glue together some slate for my cichlid tank and now I'm apprehensive about putting it in the tank because it still smells so strongly. Anyone used it?