The idea of having a small hydroponics is that it doesn't use many resources (water) and it is expandable for long term use if needed.
As it is right now it wouldn't support a small animal.
Now we have the answer to why the Alien Chick was burning a candle... She's from the planet Ren and has SPACE MADNESS! Kaydee is likely manipulation the AI and haman chick could be in trouble...
"Look Noeme, it's the AI shutdown button," says the alien girl in her most inocent tones.
"Kaydee, that's the airlock emergency overide," glared the brunette through a furrowed brow. "Actuating that would space me!"
"Oh, you could be right," demurred Kaydee, "but I was sure it was the AI kill switch!"
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