What's more important to living?
1. air to breathe
2. food to eat
3. water to drink
Just like the question above, that is hard to say! If I had to pick one, I'd pick air to breathe so that i can live for an extra day before I die of dehydration!
I will mention that if you have the correct amount of (low) lighting, you can probably get by with the atmospheric CO2 (aka a non-CO2 tank) and little to no fertilization if you pick a decent substrate.
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