How long would you wait to put your animal in their new enclosure after using 100% silicone to seal it? And how long would you wait before putting in the substrate and plants? The tube says it cures in 24-48 hours, but I'm not sure if that means it's good to go afterwards?
I used silicone sealant on one of my hides and it took weeks to finish off-gassing. It took so long I almost threw the hide away. If I was you, I'd use a low VOC one. That might finish off-gassing more quickly.