If it's a thicker plastic you could definitely use a hot glue gun. I know they are a crafty item so most men probably don't have one lying around, but they are really inexpensive. The glue is pretty mild, but still very sticky. It's dries fairly quickly and cools down pretty quick as well so it would be safe within 10 minutes max.
I agree that the fumes from superglue might get out of control. Plus it's a mess and I always rip skin off my fingers when I use itI'm also not sure how it reacts when it's always wet. It may be fine, but I really don't know. The fumes are the main concern since BP's respiratory systems are somewhat fragile. You could also try silicon... that would work! It just takes several hours or days to dry to the point of being in wet areas.
If it's a really thin plastic you could use normal glue-like Elmers and glue construction paper to it. I'm not sure if it would be strong enough on plastic for rocks. Just don't use tape, it's a disaster for snakes and it will come unstuck in humidity.
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