I'm new to Subnautica, and have just started building deeper bases powered by bioreactors. This is working well, but every time I dive down to the base I am scared that; the power went out, all my plants died, and I won't have enough air to double back up to the surface. Occasionally power was out when I arrived and my plants didn't die. I don't know if that is because I got there quickly enough, or if my plants simply won't die.
Right now I'm fueling my bioreactor with marblemelons. In the future I hope to transition to using fish when I get the alien containment tank. As such I'd like an answer that applies to food like marblemelons, and fish in an alien containment tank/aquarium.