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You can get actual aquarium silicone sealant at most fish stores, I've seen it at Pet Smart before. I've actually used this product HoldFast Epoxy Stick
numerous times and I've seen it at Pet Smart also. Call around to the pet stores in your area and see what they have. If I remember right the putty can be put in the tank right away.
GE Momentive series RTV103 for black and Momentive RTV108 for clear, if available. GE Silicone 1 or 2 for windows and doors (allow 2 to cure for 48 hours as it has an ammonia based curing agent).
Basically, you can use anything that is 100% silicone and has NO mold/bacteria inhibitors (like bathroom stuff).
Thank you guys very much! I found some aquarium safe silicon... I tried petsmart and apparently here they don't carry it anymore? I tried a hardware store, nothing, walmart, nothing, finally found little 3 oz tubes at Lowes... Sigh.. Lol