Filtration in the Planted Tank
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Filtration in the Planted Tank

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Filtration in the Planted Tank
Old 01-30-2014, 03:12 PM   #1
 
Question Filtration in the Planted Tank

The aquarium setup guide from Aqueon states the following in the section concerning filtration:

"Keeping your aquarium water healthy for aquatic life includes making sure that there is plenty of dissolved oxygen for your fish to extract from the water. This is especially true in aquariums filled with live plants and those that may become a little overheated in the summer. Both situations can lead to dangerously reduced dissolved oxygen levels, especially if the bio-load (fancy term for fish & plant occupancy level) is excessive. Your Aqueon Power Filter helps increase dissolved oxygen levels day and night by pumping more oxygen into water filtered through the wet/dry stage, and by the filtered water’s exposure to air as it cascades out of the filter on its way back into the aquarium."

I'm confused by the statement regarding live plants. Live plants require CO2 and produce O2, don't they? So how does an aquarium "filled with live plants" lead to "dangerously reduced" oxygen levels? Moreover, isn't it possible that excessive movement at the surface or across the filter could inhibit plant growth by driving out CO2?

Am I misunderstanding something, or does the marketing department at Aqueon have it wrong?
Diver Down is offline   Reply With Quote
Old 01-30-2014, 03:29 PM   #2
 
Quote:
Originally Posted by Diver Down View Post
The aquarium setup guide from Aqueon states the following in the section concerning filtration:

"Keeping your aquarium water healthy for aquatic life includes making sure that there is plenty of dissolved oxygen for your fish to extract from the water. This is especially true in aquariums filled with live plants and those that may become a little overheated in the summer. Both situations can lead to dangerously reduced dissolved oxygen levels, especially if the bio-load (fancy term for fish & plant occupancy level) is excessive. Your Aqueon Power Filter helps increase dissolved oxygen levels day and night by pumping more oxygen into water filtered through the wet/dry stage, and by the filtered water’s exposure to air as it cascades out of the filter on its way back into the aquarium."

I'm confused by the statement regarding live plants. Live plants require CO2 and produce O2, don't they? So how does an aquarium "filled with live plants" lead to "dangerously reduced" oxygen levels? Moreover, isn't it possible that excessive movement at the surface or across the filter could inhibit plant growth by driving out CO2?

Am I misunderstanding something, or does the marketing department at Aqueon have it wrong?

I think what they are worried about is the pH drop (carbon dioxide increase) at night when the plants sleep.

In my non circulated non filtered tanks I simply don't have that problem. The lowest ph (just before lights out) is still much higher then the highest non plant ph. So the tank has a much lower co2 level with plants then without.

but it could be that circulation would actually decrease the oxgen and increase co2 when the lights are on. Which might result in a more significant ph drop with higher co2 and lower oxygen during lights out.

I just don't see that in my tanks.


my .02
beaslbob is offline   Reply With Quote
Old 01-30-2014, 03:56 PM   #3
 
Interesting. Thank you. In your tanks, roughly how much of a drop does occur between the highest daylight pH (lowest CO2) and the lowest nighttime pH (highest CO2)?
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