Ph and Water Changes - The Planted Tank Forum
 
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post #1 of 12 (permalink) Old 01-28-2005, 05:19 AM Thread Starter
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Question Ph and Water Changes

Ok. Something has been bugging me that I can't seem to understand.

If my water starts as this:
PH = 7.8
KH = 4

With a KH of 4, the chart I have says to get the PH to somewhere between 6.8 and 7. Ok fine, so I set my PH controller to say 6.9 and it takes care of it.

Ok now it is time for a water change. I drain whatever amount and then replace it with the PH 7.8 water. Won't this cause a drastic sudden PH change to the tank especially with a large water change? Wouldn't this potentially be fatal to the fish? I understand that eventually the PH would come back down but that would be gradual. I figured to limit this swing smaller more frequent water changes would be in order but I read that some of you do 50% or more at one time.

Am I missing something here? Please explain.

Thanks
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post #2 of 12 (permalink) Old 01-28-2005, 05:29 AM
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Have you had any ill effects as of yet?
My tap water ph is 7.4 I run ph of 6.5 w/ kh:3 giving me appro. 28.5 ppm C02
Doing 50 to 70% H20 change weekly, fish and plants are fine,
I think fish are more tolerent than we give them credit for. My fish actually seem to like it, the shrimp kind of freak out for a bit, but overall, everything does very well.

Craig

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post #3 of 12 (permalink) Old 01-28-2005, 05:35 AM Thread Starter
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No I'll effects because the tank is completely empty right now. I'm waiting on my house remodel to finish then I'll set it up. It is nice to have some reassurance that things will be ok. I just figured that the fish would have a hard time with this similar to acclimating them to a new tank.
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post #4 of 12 (permalink) Old 01-28-2005, 09:54 AM
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Smaller waterchanges certainly makes more sense. however in a planted tank I do somthing like 10% every two weeks except for the discus one that gets 10% change twice a week.

I am a bit lazy that way, but never had any big probs with the water params, plants really do make a huge difference.


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post #5 of 12 (permalink) Old 01-28-2005, 04:31 PM
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Quote:
Originally Posted by WfxXx
Have you had any ill effects as of yet?
My tap water ph is 7.4 I run ph of 6.5 w/ kh:3 giving me appro. 28.5 ppm C02
Doing 50 to 70% H20 change weekly, fish and plants are fine,
I think fish are more tolerent than we give them credit for. My fish actually seem to like it, the shrimp kind of freak out for a bit, but overall, everything does very well.
That sums my feelings up perfectly. I have a 'natural' pH of 7.8, 8dKh. I do 50%-60% water changes, so my CO2 adjusted pH goes from 7.0 to 7.4 (roughly). My fish don't seem to mind one bit. I haven't had an unexplained death in any of my tanks for a while (months). I have had a couple explainable deaths...Kribs are vicious when they are new parents

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post #6 of 12 (permalink) Old 01-28-2005, 04:54 PM
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My tank with CO2 is 6.6 and tap ph is 7.6. No problem with straight tap water for 60% water changes. My discus don't mind.


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post #7 of 12 (permalink) Old 01-28-2005, 09:59 PM
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I have massive problems with this. When i do a water change i lose at least 2 fish (tetras and raspboras). My tank water is 6.8-7.0 and my change water is pH 8-8.2. Soon as i do a WC, my fish just dont look happy. They get red streaks thru thier fins and yeah, some die. I could not for the longest time figure out what was killing them, but according to others on varying fish forums, they definately say its the huge pH swing, even if i do only a 20% WC, i still lose fish. Im now trying to lower the change waters pH before adding it to see if that makes my fishies live longer. See with pH, every 0.1 change in pH is 10 times +/- the previous pH. Obviously others dont have problems with the pH swings, but i do for sure. My tank is only a 10gal tho, whether that makes a difference, 50% WC is still a 50% WC no matter the size.

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post #8 of 12 (permalink) Old 01-29-2005, 01:02 AM Thread Starter
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Thanks all for the replies.

Grungefreek - Is your 10 planted and if so are you injecting co2?
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post #9 of 12 (permalink) Old 01-29-2005, 01:16 AM
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Quote:
Grungefreek - Is your 10 planted and if so are you injecting co2?
Yep it is. Swords, Wisteria, stargrass, glosso, ambulia, anubias and hygro polysperma. Yes i inject Co2, DIY with DIY diffuser.

25gal in progress, just deciding on lighting and then its full steam ahead!!!!!
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post #10 of 12 (permalink) Old 01-29-2005, 01:25 AM
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Quote:
Originally Posted by grungefreek
I have massive problems with this. When i do a water change i lose at least 2 fish (tetras and raspboras). My tank water is 6.8-7.0 and my change water is pH 8-8.2. Soon as i do a WC, my fish just dont look happy. They get red streaks thru thier fins and yeah, some die. I could not for the longest time figure out what was killing them, but according to others on varying fish forums, they definately say its the huge pH swing, even if i do only a 20% WC, i still lose fish. Im now trying to lower the change waters pH before adding it to see if that makes my fishies live longer. See with pH, every 0.1 change in pH is 10 times +/- the previous pH. Obviously others dont have problems with the pH swings, but i do for sure. My tank is only a 10gal tho, whether that makes a difference, 50% WC is still a 50% WC no matter the size.

Grunge
It is probably not PH, but chlorine/chloramine problem in your water. Do you add any water conditioner to dechlor?


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post #11 of 12 (permalink) Old 01-29-2005, 06:54 AM
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Quote:
It is probably not PH, but chlorine/chloramine problem in your water. Do you add any water conditioner to dechlor?
Yep i do. the thought of high Chlorine/chloramine came up, as did contaminated water barrel, but everyone thought it was more likely to be the pH swings. I age my water for a week with dechlor. If i had really high chloramine, i would be running into ammonia problems, but i havent, so i doubt its that. So far everyone thinks pH swing.

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post #12 of 12 (permalink) Old 01-29-2005, 08:47 PM
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Then good luck trying the ph swing route. Let's know how it works out


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---------------------
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