Hi. I'm wondering if this is necessary when my plants are quite new? My tank is small, 60l and I have around 20 plants in it. I'm running pressurised co2 and read that oxygen can get dangerously low at night. I've forgot to turn on the air pump (timer needed) a few times, but the co2 is on timer. Nothing bad seems to have happened so far so wondering if I need to turn it on for a small tank with a few plants.