THe make of silicone is not really important, the critical question is the type. It needs to be high modulus, not low modulus. High modulus means (in the UK anyway) suitable for total immersion in water, whereas low modulus means surface waterptoof only. This is the type frequently used to seal bathrooms and work surfaces, and often contains anti-fungicides. Lastly, it should state on the tube if it's safe for aquarium use. If it doesn't, don't use it!