ph shift? - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 03-19-2009, 06:13 PM Thread Starter
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ph shift?

hi all
i have a 75 heavily planted tank with co2 and such and i had planned on adding my discus to this setup
the 75 planted tank sits at 7.0 constantly
i added them a week ago and now its time for a w/c

my tap is at 7.6 and aged overnight in a drum with some serious agitation is at 7.8

so what % of a w/c can i get away with without stressing my discus and having some serious issues?

im thinking if i change 50% it would be to much of a ph swing
im sure it would level out eventually but..

anyone else here encounter this problem?
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post #2 of 4 (permalink) Old 03-20-2009, 02:22 AM
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If I'm not mistaken the ph of your tank is 7.0 and not at 7.6 which I assume is the water that you filled the tank with, correct? If that is the case then the ph has been brought down from 7.6 to 7.0 because of the addition of CO2. A ph swing caused by daily addition of CO2 won't harm your fish unless you are injecting too much. Do you turn off CO2 at night? What kind of a CO2 system do you have?


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post #3 of 4 (permalink) Old 03-20-2009, 07:57 AM Thread Starter
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Quote:
Originally Posted by MarkMc View Post
If I'm not mistaken the ph of your tank is 7.0 and not at 7.6 which I assume is the water that you filled the tank with, correct? If that is the case then the ph has been brought down from 7.6 to 7.0 because of the addition of CO2. A ph swing caused by daily addition of CO2 won't harm your fish unless you are injecting too much. Do you turn off CO2 at night? What kind of a CO2 system do you have?
my lights and co2 are on a timer
so co2 is turned off 30 minutes after the lights go out
ph is constantly at 7.0

the reg is an aquatek i think ,with a 5lb tank 3-4 bps

tank is at7.0
the water being added to the tank during a w/c at 7.6
will i have a big ph swing during a 50% w/c
if so how much water can i change without having a major ph swing
and causing ph shock to my discus?
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post #4 of 4 (permalink) Old 03-20-2009, 04:35 PM
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I guess I'm having trouble understanding why your tank ph is a constant 7.0. If you inject CO2 your ph would drop during those hours unless you aren't adding enough of course. The water that you started the tank with...wasn't that your tap water (at 7.6)? What I'm getting at is that if your tank ph is naturally 7.6 and CO2 is bringing it down to 7.0 then that ph swing shouldn't have any effect on your fish. On the other hand, if you tank ph is 7.0 because of some other reason then yes, there might be some stress with changing ph too abruptly. A 10% change of water would have only a small amount of shift or even 20% for that matter. Try that and keep an eye on the fishes.


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