Help! What Causes Sudden Rises In Ph?

Handelma

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So I've had a 10 gallon for over 1 year and usually my pH stays at 8.2, recently its been climbing to 8.4 and I'm not sure why. I tested my water on Thursday and it was 8.2, today 2 days later its 8.4 when I did not add anything to the tank except fish flakes and frozen food. Also my kH is is very low (same as my tap water), but my gH is high (16 drops).

Everything I've added to my tank in the past 2 months:

1 dose of seachem replenish
many live plants bought online
4 seachem root tabs
prime water conditioner (w/waterchanges)
API water conditioner for stress coat (w/water changes)
thrive liquid fertilizer by Niloc G (w/ water changes)

Any suggestions why my tank pH goes from 8.0 right after a water change, to 8.2 five days later, than 8.4 seven days later?

I'm confused by this so input would be appreciated.
 

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whats the pH of your tap water?

KH is the buffering ability, high KH keeps the pH stable, low KH allows for changes in pH.
 

Colleen B

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Skavatar said:
whats the pH of your tap water?

KH is the buffering ability, high KH keeps the pH stable, low KH allows for changes in pH.
How would you increase KH without increasing ph or gh?
 
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Handelma

Handelma

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Skavatar said:
whats the pH of your tap water?

KH is the buffering ability, high KH keeps the pH stable, low KH allows for changes in pH.
My tap had pH of 8.0
 

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distilled water or reverse osmosis water can help lower GH by diluting the calcium and magnesium concentrations in your tank.

crushed coral (carbonate) can help increase KH.

fish, plants, and nitrifying bacteria all consume carbonate, thus lowering KH, allowing the high GH to increase pH.
 

Colleen B

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Skavatar said:
distilled water or reverse osmosis water can help lower GH by diluting the calcium and magnesium concentrations in your tank.

crushed coral (carbonate) can help increase KH.

fish, plants, and nitrifying bacteria all consume carbonate, thus lowering KH, allowing the high GH to increase pH.
Does crushed coral increase gh as well as kh?
 

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Nothing added in the tank? Does your water change ph sitting in a cup/ bucket overnight? Trying to see if it's only rising in the tank or if it also raises as it gasses off and rests. Maybe a water softener system involved.
 
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Handelma

Handelma

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Carbeo said:
Nothing added in the tank? Does your water change ph sitting in a cup/ bucket overnight? Trying to see if it's only rising in the tank or if it also raises as it gasses off and rests. Maybe a water softener system involved.
The only thing added was fish food. I usually do flakes, but once a week I'll do frozen. Could there be something in frozen food that would raise the pH? I only feed a small sliver of the frozen block.
 

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I really have to research this better. I looked up ways to separate kh and ph but they are supposed to be directly linked. Kh isn't a buffer. Buffers are. High kh equals high ph so I'm stumped at how this happens
 

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"KH
It is a measure of the water's buffering capacity; the higher the KH, the higher the pH in absence of other chemicals in the water, and the more resistant the water is to downward fluctuations when an acid is added."

 

Carbeo

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No, I meant more like decorations being added. Can you try the test to see if the tap water swings? That can happen when it releases gasses. If the tap and tank don't match in a well maintained tank I always like to see if tap water that is rested test differently than fresh out of the tap. Do you have a water softener system? Similar phenomena.
 
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Handelma

Handelma

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Carbeo said:
No, I meant more like decorations being added. Can you try the test to see if the tap water swings? That can happen when it releases gasses. If the tap and tank don't match in a well maintained tank I always like to see if tap water that is rested test differently than fresh out of the tap. Do you have a water softener system? Similar phenomena.
So today I tested my tank, its back up to 8.4. I also tested some water in a vase with floating plants and its ph is 8 (same as tap). When I added my plants they have metal bendy things that help weigh them down and keep them in the substrate. Could those cause a rise in pH? I assumed they were aquarium safe because I've seen them on plants in my LFS.
 

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Handelma said:
So today I tested my tank, its back up to 8.4. I also tested some water in a vase with floating plants and its ph is 8 (same as tap). When I added my plants they have metal bendy things that help weigh them down and keep them in the substrate. Could those cause a rise in pH? I assumed they were aquarium safe because I've seen them on plants in my LFS.
Plant weights are safe.

The only thing Ive got at the moment is researching the reverse of this issue in reef tanks. They use co2 reactors apparently in the reverse of the way we do for planted tanks in that they pull co2 out of the water to increase ph. How much water disturbance do you have at the top of your tank?
 
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Handelma

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Wraithen said:
Plant weights are safe.

The only thing Ive got at the moment is researching the reverse of this issue in reef tanks. They use co2 reactors apparently in the reverse of the way we do for planted tanks in that they pull co2 out of the water to increase ph. How much water disturbance do you have at the top of your tank?
I have a HOB filter that allows for a small flow, not strong enough to move the plants, but it moves the flake food around, and sometimes a guppy will get pushed by the current.
 

Señor Pescado

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Do you 'top off' your aquarium for losses due to evaporation with tap water? If so, sooner or later, I would imagine that your pH and hardness would only go up.
 
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Handelma

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Wraithen said:
Is there rippling water at the surface though?
There is slow movement at the surface, a floating object would move around the surface. Its not still, but its not a strong current either.
 
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Handelma

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Señor Pescado said:
Do you 'top off' your aquarium for losses due to evaporation with tap water? If so, sooner or later, I would imagine that your pH and hardness would only go up.
I do all water changes with tap water. I don't top up because I don't see much evaporation with a glass lid.
 

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