Sort of. I guess I was thinking about the stygian depths of the oceans. Is it the plankton soaking up all the light, or is the "negligible" absorption of the water because there's only a couple hundred gallons in a tank, vs the scary-huge amounts of water in lakes and oceans.
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Given that plankton accounts for the majority of the Earths O2 production and it can literally be seen from space... I'm sure it's a combo of both but I'd wager mostly plankton.