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post #1 of 7 (permalink) Old 12-16-2013, 08:54 AM Thread Starter
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probably stupid question

are airstones/airpumps actually needed?
I was reading that people turn on airstones at night to outgas co2
but what about in the day? do people generally have them on only at night for co2?

if so how are the fish getting oxygen if there is no airstone or topside disturbance ?
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post #2 of 7 (permalink) Old 12-16-2013, 09:15 AM
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Airstones/Air pumps are not absolutely required, provided you have sufficient surface agitation to allow for gas exchange to occur.

Some people like to turn on an air pump at night for extra surface agitation to prevent CO2 from building up, but again, this is not absolutely required provided you have sufficient surface agitation.

During the day, when plants are photosynthesizing and producing oxygen, there is no need for excessive surface agitation. Furthermore, excessive surface agitation will drive off the CO2 that you (may be) injecting.

Oxygen will naturally diffuse into the water column from the atmosphere, provided sufficient surface agitation is present.

Anthony


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post #3 of 7 (permalink) Old 12-16-2013, 11:30 AM
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Sufficient surface agitation being lots of ripples at the water surface without actually breaking the surface.

Here's a random image from the internet for example. See the large amount of ripples, but no actual breaking of the water surface. No splashing. So you won't see air bubbles coming down from the surface. These ripples increase the surface area so allows more gas to be exchanged. Co2 holds pretty well in the water unless you agitate it heavily.

This image is an example of proper surface agitation.



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post #4 of 7 (permalink) Old 12-16-2013, 11:40 AM
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What size tank do you have?


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post #5 of 7 (permalink) Old 12-16-2013, 06:20 PM Thread Starter
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38 gal long tank
I have 1 stone and 1 bubble wand hooked to the same air pump (the pump has 2 outlet valves)
the bubble wand creates much less turbulence on the surface but still causes ripples

if I just had a bubble wand going that would "increase the potency" of the co2 so to speak? and still be enough air for the fish? its only a diy co2 btw 2x 1 liters
and can I plug one of the valves on the air pump or would that break it?
its a petco brand airpump
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post #6 of 7 (permalink) Old 12-16-2013, 06:30 PM
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with DIY co2 I don't think it'd be possible to gas your fish.


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post #7 of 7 (permalink) Old 12-16-2013, 07:29 PM
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Quote:
Originally Posted by scapegoat View Post
with DIY co2 I don't think it'd be possible to gas your fish.
I agree with this, one of the pros for DIY co2, but also I use an air stone to increase water movement in heavily planted areas of my tank. If I don't I tend to get Cyanobacteria in those areas.

-Jacklyn
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