Wiping out my AIO 20g cube waterbox, a 6" long, thin rounded strip of black silicone floated up. It is the interior angle of the joint maybe where the glass meets the filtration wall, I think, not the interior glass-to-glass seam, but I didn't see its origin. Is there a safe way to repair? There is no leak AS OF NOW. I am just worried about a potential tank failure. Tank is only 5 years old and on a waterbox stand. Would you drain the tank and reinforce-silicone? How long to cure before putting fish, rocks and coral back in?
