What happens when the corals grow larger and the glass breaks under the pressure? There have been others to try this method only to abandon it a few years later once they start seeing the broken glass damaging marine life 😭. Plus even though it “not much” the cement will not allow most species to adhere to it as it’s toxic for the corals, and the only people that win with use of concrete is its manufacturer, whose primary function is truly the destruction of the planet. Food for thought. We’re just with the belief that this is a short term solution with more long term effects. You only need to attach coral fragments to natural substrate, the dead coral skeletons. 💯% natural substrate, free, and has all the minerals the corais need to thrive! Just supporting the natural way that coral have always chosen to live is the easiest way with: time, money, and effectiveness. Nevertheless, I’m wishing you and the ocean the absolute best of success, just wanting to bring up lessons learned by others ❤️🙌🌊