10-14-2011, 04:49 PM
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The desirability of water movement (oxygenation) depends greatly on your fish, and to some degree, your plant stocking levels. If I don't agitate my very heavily planted 55 gallon tank's surface, my fish have faster respiration rates (gill movements) and my corys make more frequent "trips" to the waters surface for supplemental O2. Biologically, plants actually consume CO2 in darkness and this, in combination with your fish, can raise tank CO2 to harmful levels overnight in a heavily planted tank. Plants only generate oxygen when they can photosynthesize (under light). If anything, I would recommend agitating the tank water when the lights are off. That will benefit both the fish and plants.
That being said, minimal surface movement is good in a planted tank to minimize CO2 loss.
Last edited by DKRST; 10-14-2011 at 04:52 PM..