RE: PH/sponsorship

["Scott McLaughlin" <relli@aye.net>]

If there are plants in the tank, then CO2 will increase at night. They will likewise
decrease during the day. This is due to the fact that CO2 is being released
at night and used during the day as part of photsynthesis. This fluctuation
in CO2 will cause a swing in the pH. Also, I don't think that anyone has ever
proven that pH (within reason) swings have any effect on fish or plants. My
fish certainly aren't bothered by it. Well, at least not enough to stop spawning.



>I have heard this many times in the past and until now haven't had the 
>opportunity to test this theory. Many people have also said that having CO2

>on at night makes very little difference to acidity.
>I am just about to install a totally automatic CO2 system and will include
a 
>monitor to permit an accurate measurement of when and for how long the CO2

>is switched on. Perhaps we can finally lay the ghost.
>
>BTW, as I've mentioned in the past, I'm in the process of starting an 
>e-business (very small scale at first) and am looking at the idea of 
>sponsoring original research into behaviour WHY of aquarium fish/equipment

>etc. If anybody has any ideas as to what they'd like to investigate (esp. 

>apisto related if poss.) I'd be interested in hearing from you. Sponsorship

>would probably be in the way of good/materials.
>
>Colin
>
>
>>From: "Gregory Nielsen" <gnielsen@andinet.com>
>>Reply-To: apisto@majordomo.pobox.com
>>To: <apisto@majordomo.pobox.com>
>>Subject: RE: PH
>>Date: Tue, 2 May 2000 20:36:16 -0500
>>
>>Mike,
>>
>>the lower pH is probably due to a buildup of CO2 during the night from 
>>plant
>>and animal respiration. The pH goes up when you turn on the filter and the

>>circulation helps to get rid of the excess CO2. If you have plants in the

>>aquarium they can use up the available CO2 in the day and the pH will rise.

>>These pH swings are common in soft, poorly buffered water.
>>
>>Greg Nielsen
>>
>>
>>
>>
>>
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