Can someone please tell me specifically what brand of silicone can be used in an aquarium? I have been using small, toothpaste size tubes of Duponts "Aquarium silicone", but I would like to find something larger. I see dozens of silicone or calking, but none with certainty that are pure silicone. Robert Paul H http://www.aquabotanic.com Potted Glossostigma, dwarf lobelia, C. lucen San Jose, CA USA