Caulk has one of three (or mixed) bases - latex, silicone, or elastomeric. When you see silicone sealant, that is a caulk. There are also silicone based lubricants... as many other products (which aren't pertinent) that I cant even think of at 3 in the morning.
I personally think the best sealant in a cage to use is GE Silicone 2 for Windows and Doors. This has the least amount of toxic chemicals in it (however they aren't toxic once cured). Silicone is an element and the nature of the element is it will never dry hard. It will dry to a solid but it will remain flexability forever. Pure silicone takes a LONG time to offgas though... you're looking 2-3 weeks.
If you use a latex modified silicone caulk (white lightening or something of the sort) then you wont have one that will remain quite as flexable - but under normal use its waranteed for like 50-75 years or something. The latex taking place of the silicone will cause the caulk to cure quicker, taking less time to offgas.
The aquairum sealant stil needs to offgas, and is toxic before fully cured. My friend sadly learned that the hard way by losing a softshell turtle to that.
Hope it helped.
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-Chris
The reason mainstream thought is thought of as a stream is because it's so shallow. -George Carlin
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