New tank - Ph help! - The Planted Tank Forum
 
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post #1 of 11 (permalink) Old 04-11-2019, 06:00 PM Thread Starter
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New tank - Ph help!

I am in the process of setting up a new 54g tank. As of now it has black diamond blasting sand, several small plants, a fake log, heaters and a hob filter. No fish yet!

I filled it with water. Tested the water the next day. Ph was 8.4. Tested it several times to confirm. I tested the water out of the tap. Ph was 7.

I did a 70% water change and tested ph. It was 7.2. About 24 hours later I tested it again, and it is now 8.2.

What is causing this and how do I correct it?

Thanks!


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post #2 of 11 (permalink) Old 04-11-2019, 07:40 PM
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What are you testing with?
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post #3 of 11 (permalink) Old 04-11-2019, 10:02 PM Thread Starter
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API liquid freshwater test kit


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post #4 of 11 (permalink) Old 04-12-2019, 02:54 AM
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Where are you located? I have the same issue with my well water. Basically its 6.5 out of the tap, 7.2 in tank after water change, 8.0-8.2 after a day or two.

I have very soft water in my area GH about 1-2 but PH is high, not sure whats up with it.
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post #5 of 11 (permalink) Old 04-12-2019, 03:15 AM Thread Starter
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Iím in Central VA. Should I even be super concerned about this? Depending on what I read I either have a major issue or nothing to worry about!


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post #6 of 11 (permalink) Old 04-12-2019, 03:03 PM
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The likely reason is that the plants are consuming the CO2 in the water that you are adding, thus raising the PH. It's nothing to be concerned about, but if your goal is to have a tank full of flourishing plants, you may want to consider adding a CO2 injection system.

I'd recommend using the articles in this site as a reference: https://www.advancedplantedtank.com/
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post #7 of 11 (permalink) Old 04-12-2019, 05:04 PM
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Take a sample of your tap water in a clean glass container and leave it out for 24 hours and test again. Post the results.

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post #8 of 11 (permalink) Old 04-12-2019, 05:48 PM Thread Starter
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I donít know that there are enough plants in there to cause the problem. They are all brand new baby plants.

I did take take some water straight from the tap and placed it in a bowl. PH was 7-7.2. I will test after the 24 hour mark when I get home tonight. I will let you know!

Am I over thinking this anyway? Will this even cause any problems? I planned on getting some driftwood in there as well, which may help a bit.

Thanks everyone for the help!


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Ok! So the water straight from the tap was about 7-7.2. I let it sit for almost 24 hours and it is now at about 8.2.

Aquarium has been running for about 48 hours and it has stabilized at about 8.2-8.4.

I guess I should not worry about this?

I will add a bit of driftwood (I was planning to anyway) and avoid 50%+ water changes. This should prevent jumps in the ph. I will also just take a bit more time/care with the acclimation process.

Does that sound like a good plan or should I be going in a different direction?

Thanks!


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Last edited by Darkblade48; 04-23-2019 at 06:28 AM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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post #9 of 11 (permalink) Old 04-13-2019, 09:45 AM
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What about excess water surface agitation? To much bubbling can drive off CO2. You just want a nice gentle ripple across surface not the output of filter drawing a bunch of bubbles down into tank.
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post #10 of 11 (permalink) Old 04-13-2019, 06:40 PM
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Keyrent, thanks for the update!!

I'd guess that your water has a good amount of alkalinity (KH) which is why you are seeing the pH value rise after 24 hours.

The higher pH may or may not be a problem depending on which species of fish or animal you are planning on keeping in your tank. More details of your stocking preference would be helpful as well as if you plan on using CO2.

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post #11 of 11 (permalink) Old 04-13-2019, 10:42 PM
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So this seems to come up frequently. A lot of folks see the pH of their tap water rise after it sits in a tank for a while. What is your carbonate hardness (tested on water that's sat out a while?)

When pH is low for a given carbonate hardness, it implies high CO2 levels in the water (relative to normal room air). This can happen with groundwater and even with other water supplies. When you bring the stuff into the air, it equilibrates (losing CO2) and the pH goes up.
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