ok i might be overthinking this but: the magmarang, right? it’s a creature in subnautica that lives in the lava zone, which is the deepest biome and like literally a volcano. the magmarang is a hand-sized boomerang-shaped fish that’s a relative of a surface level herbivorous fish just called the boomerang; it adapted to live in the lava zone. it’s the smallest creature in this zone, so it’s probably the bottom of the food chain.
there are no plants in the lava zone. i imagine that the other, larger creatures of this biome eat each other, since they appear to be carnivores. but what about the magmarang? it’s the smallest fish in this zone and probably the only herbivore, but there are no plants??? so how does the ecosystem function at all down there? does it just… eat lava??? even if it’s carnivorous, literally what other animal would it be able to eat?? everything else down there eats it! anyway i’m confused.