GE1200 is THE silicone to use. I searched high and low before tracking a tube down at a GE Polymers office in Coquitlam close to the Home Depot. It's not a retail outlet, just an office and they tossed me a sample tube because that's all they had around! Don't ask me the exact address because I've lost it (sorry).
Anyway, the most common substitute to GE I Window&Door silicone. It smells like vinegar while curing whereas GE II smells like ammonia. GE II adheres better to more materials and is probably OK when fully cured, but the ammonia it gives off while curing is probably bad news in your aquarium.
Avoid GE I Bathroom because it contains mold inhibitors.
GE I is great for glass, but does not adhere as well to plastics and acrylics. GE1200 does and the acrylic baffles in my glass sump all form water-tight compartments as a result.
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