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post #1 of 6 Old 05-24-2007, 06:48 AM Thread Starter
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PH Questions

My PH in my aquarium seems to fluctuate considerably without making changes, ie water changes. One day the PH can be 7.6 then rise to as high as my dye kit will read of 8.6 then back down without doing anything. It finsished cycling a week ago, when i tested the water yesterday and PH was high my readings were:

Ammonia = 0
Nitrite = 0
Nitrate = 0 (note: this usually stayed around 5)
PH = 8.6 (this is high and varies between 7.6 and 8.6 without altering anything)

Anyone know why this is? It is a 100 gallon aquarium with the following:

2 x blood parrots
3 x yellow labs
3 x clown loaches
1 x albino red finned shark
11 x albino danios
8 x platies

All the fish seen ok but I am trying to maintain a medium of 7.6 which would seem to be a medim for all species in the tank
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post #2 of 6 Old 05-24-2007, 10:44 AM
squiggles1's Avatar
do you know what the GH and KH are? ph fluctuations will happen throughout the day, but not to that extent normally. Without a good buffer in your water then your ph can be more prone to rapid fluctuations.
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post #3 of 6 Old 05-24-2007, 08:10 PM
Mr.Todd's Avatar
also what substrate are you using? (i.e. how are you raising the pH for the cichlids?)

Are you using any chemical additives? :D
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post #4 of 6 Old 05-24-2007, 09:56 PM
Is your test kit expired?
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post #5 of 6 Old 05-25-2007, 11:52 AM
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It sounds like you have extremely soft water, IE the GH and KH are very low if not 0. It would help a lot to add something to buffer the water. This will keep your pH more stable. Calcium Carbonate is often used to buffer water. This si done by simply adding a small amount of crushed coral in a small bag into your filter. I just put mine right in the tank but a lot of peole have substrate that will look add with a lot of white pieces of shell and coral on the bottom.
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post #6 of 6 Old 05-25-2007, 12:12 PM

Trifish and F4A have got it here.

Your test kit is either bad (most probable*)
Gh & Kh=0.

*I say most probable because I use RO water almost exclusively.
Much earlier I had some Ph fluctuation but more on a weekly basis and not even near the wide "swings" which you are describing.

F4A's crushed coral will work "for your setup". I just have a large limestone rock which I picked up at a local quarry in my sump.

Is you daughter still enjoying her "fishies"?

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