Some live plants can also add a small amount of oxygen to a tank, but how much varies by plant and at night plants will actually absorb some oxygen.
(Some live plants; can add; a small amount of oxygen; to a tank) (how much varies by plant and at night plants; will actually absorb; some oxygen)
Some live plants how much varies by plant and at night plants
can add will actually absorb
a small amount of oxygen to a tank
some oxygen