BOTH Canadian Tire and Home Hardware sell a brand of silicone that says right on the packaging "Ideal for Aquariums"... no special extra price or anything, only comes in clear or white that I could find, just regular Interior Silicone... get that kind... 
If you really need black... GE 1200 Series construction silicone... but I'm not sure where to buy it.
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135G Mixed Reef. Bullet 2, 25 gal refugium, 2 X250W MH + 4X 96W PC\'s, DIY Calcium Reactor, Coralife 1/6 HP Chiller, Phosban, Tunze, 2 closed loops & SQWD\'s, Seios, Coralife 4 stage RO/DI & a bunch of other expensive gadgets... I may never retire, but I'm gonnahavahelluvanaquarium!
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