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Old 02-12-2020, 12:05 PM   #1 (permalink)
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Default New to planted tank, need quick advice on Co2 and water movement!

So I currently have a 150 gallon 6 foot planted tank, which I recent have a Co2 system on which is going well. I read conflicting arguements wether or not to have a water pump I guess you can call it to push the water around and have water movement. Would that help the co2 flow around the tank better? Or does it work against itself? I do have a fluval fx6 that the outlet pump does push pretty hard but I'm not sure if I need another air pump that hangs off the sides of the tank pushing the water around and giving water flow?
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Old 02-12-2020, 01:41 PM   #2 (permalink)
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Default Re: New to planted tank, need quick advice on Co2 and water movement!

Yes, water movement help distribute CO2 around the tank which helps plants absorb co2. You don’t necessarily want rigorous water surface agitation which speeds up co2 degassing, leaving the water.
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Old 02-12-2020, 02:51 PM   #3 (permalink)
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Awesome thank you! By any chance do you know of a good one I could use? I'm kinda lost on what kind to get , I see all mix reviews online
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Old 02-12-2020, 06:53 PM   #4 (permalink)
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Default Re: New to planted tank, need quick advice on Co2 and water movement!

Consider that CO2 in water is dissolved into the water, just as any other substance that dissolves is. The water can't maintain much of a gradient of concentration of anything dissolved in it. That alone gets CO2 spread throughout the water - water with high CO2 concentration quickly loses the CO2 to an area that has low CO2. That is because CO2 dissolves in water very, very easily. It is probably impossible to actually measure the CO2 concentration of different areas of the tank, but theoretically the differences would have to be small. Good water circulation should be more of an issue for keeping good dissolved oxygen in all areas of the tank.
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Old 02-12-2020, 08:07 PM   #5 (permalink)
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Default Re: New to planted tank, need quick advice on Co2 and water movement!

Gas diffusion rate is slow in water since it’s denser than air.
CO2 diffusion rate at 77F in water is 1.91x10^-5 cm^2/sec
O2 is 2.42x..........

Since gases move slower, there is less chance of co2 moving into a leaf for the plant process. Water movement help speed things up. As does O2 for fish. Fish have the advantage of moving water over their gills and swimming to the surface in low O2 situation.

Last edited by mistergreen; 02-12-2020 at 08:36 PM..
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Old 02-13-2020, 03:05 AM   #6 (permalink)
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You guys are so helpful! All this information is incredibly helpful! Thank you! Do you guys suggest I just get one ans put it on one side or two and have one on each side, since it's a 6 foot tank which I pretty long I would assume? And any recommendations on what brand is good? I see some they say leak voltage and stuff in the tank which is crazy to me
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