Aquarium Silicone Sealant, Clear 10.2 fl. oz. Having the right tool for the job is perhaps the best way to ensure that your project comes together neatly and performs the way you designed it. Silicone is one of the most commonly used tools of our trade, whether you are repairing an aquarium or finishing your DYI project. It should come as no surprise that high-end professional aquarium and filter manufacturers don’t run to a pet department store for a small tube of generic silicone.