It’s buried in the comments to the actual video 3 days ago.Can you link the video where Ryan talks about this
“Tank is 5 years old and we got one of the first 750xxl off the line. This was one of their first attempts at a larger tank. I believe the issue was the front pane was too heavy to not be supported and ~10% of that first batch was affected. I was told to look out for the silicone coming away from the glass and sand working it's way in., When we saw that it was time to move the corals, I didn't want to wait for an emergency.”