Anyone have any info on silicone used to seal glass aquariums. MY local fish store only has small tubes of All Glass brand but it would take too many to seal my 270 gallon. I have sealed it twice already with GE 100% Silicone I only to have it leak a few months later. Anyone have experience with resealing tanks. I have resealed smaller tanks 10-55 gallons with no problem. Obviously a 270 has greater pressure.