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I have a tall 37-gallon aquarium (its like 30 inches x 30 x 12 or something close). I have 2 hanging filters rated 20-40 gallons (I like a lot of water flow) and one Tetramin fermentation CO2 supply. My pleco and rainbows love it when I leave the water a few inches low so there is a plunge current, but I typically fill the aquarium pretty high so there is less surface turbulence.
Will leaving the water lower remove too much CO2 or not?