Creak and Pop??! That's very strange.
But as long as they don't get involved in a tragic head on collision, a plane crash out over the Indian Ocean, get their heads stuck in a drill press or some other terrible accident, I'd imagine they die just like any other animal dying of old age.
I'd imagine they will peacefully just pass in a dark spot of their tank. .. really hope the creaking and popping doesn't happen cuz I'd feel miserable for them.
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