Another pH question... 8.3?? - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 11-30-2007, 02:00 PM Thread Starter
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Another pH question... 8.3??

My new 90 gallon planted tanks pH was OK at 7.5 with crappy lighting.

After a month I added minimal 1.44 watts/gallon lighting my ph has gone up to 8.3

The tank has about 10 lbs of driftwood, Flourite substrate, No Co2, and no fertz have been added.

My ph has gone form 7.5 to 8.3 in about 2 weeks.

Should I be concerned for my swords???

Everything seems to be doing fine but I am afraid my pH will continue to rise.

I was thinking peat pellets in the canister.

My tap water is about 9.0 and don't want to complicate my life with RO water etc.

Thanks
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post #2 of 9 (permalink) Old 11-30-2007, 03:11 PM
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How did you get from 9 out of the tap to 7.5 in the tank?

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post #3 of 9 (permalink) Old 11-30-2007, 03:28 PM
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maybe get a new test kit. Some kits dont work well

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post #4 of 9 (permalink) Old 11-30-2007, 04:03 PM Thread Starter
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Quote:
How did you get from 9 out of the tap to 7.5 in the tank?
I have no clue.

This is a newly setup tank. I only used a cycled canister form another tank to get things moving.

This is the first tank I setup in this house.

I just threw everything together and initially got 7.8.

It went down to 7.5. So I bought my Aamazon Swords etc.

Over the past two weeks the pH has been slowly creeping up.

I use a Hanna digital pH meter which I calibrated about a year ago.

I need a neutral 7.0 solution to recalibrate but even if it is not calibrated correctly the pH is still going up.

Is there a solution I should clean it with or something???
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post #5 of 9 (permalink) Old 11-30-2007, 04:18 PM
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Has the KH also gone up? What about GH? Could be something in the tank is leaching out into the water.

Kevin

72g bowfront planted, CO2, 4x - T5HO, Eheim 2213 and 2217, 2 angels, pristella tetras, blue tetras, betta, albino bristlenose pleco, albino cories. Sword, vals, hygros, ludwigias, java moss and fern, anubias

2g Mac-quarium. Clown gravel, fluorescent plastic plants, and 2 guppies.
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post #6 of 9 (permalink) Old 11-30-2007, 06:55 PM
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Yeah, what type of rocks if any?

Your pH goes down out of the tap because the water plant adds things for algae control and pipe corrosion etc. They precipitate out of the water within a day or so and the pH settles. Sometimes acids in the tank will bring it down another degree or more after it's been added. The water plants are notorious for switching things up quickly too. Could also be that you have high alkalinity in your tap, and with water changes(how often?) it's building up beyond what the tank's acids were holding it at before. If that's the case you are going to have to find a softer source of water or try peat/CO2 if you want to get it down, or go cichlid shopping. As far as I know, a lighting change shouldn't have anything to do with it, just a coincidence.

What your tap's KH and the tank's KH?

Have you changed any additives in the last few weeks or so?


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post #7 of 9 (permalink) Old 11-30-2007, 07:46 PM Thread Starter
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Quote:
What your tap's KH and the tank's KH?

Have you changed any additives in the last few weeks or so?
I have to be honets I have only checked pH.

I chaned 30% of the water a few days ago and there was a pH increase but it has not come back down.

I will test again today and see if it came down.

I will probably go peat shopping as well.
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post #8 of 9 (permalink) Old 11-30-2007, 08:30 PM
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Only reason I ask about additives is because there are some that can affect alkalinity, which is in direct relation to you pH. Liquid Amquel Plus for instance, if you were to stop using it you would likely see a pH increase as alkalinity is replaced by WCs. Who knows what other things are out there that I don't know about.

Basically KH = pH aside from many other factors involved. If you can monitor and log any KH changes than you'll better understand what's happening to your pH. If you see a rise in pH after a WC but no change in KH than you can conclude that it's another factor aside from an alkalinity increase. GH plays a role but not as substantial as KH. The CO2/O2 relationship also has an effect on pH. Vigorously aerate stagnant soft water in a 5gl bucket and watch the pH climb quickly. As well as the water treatment plant additives I mentioned, like soda ash, my tap comes out at pH8 and settles to 7.2 within 24 hours if left in an open bucket. Acids in my tanks settle that to 7, then CO2 settles it to 6.4-6.6. Alkalinity remains the same, every change in my case is due to CO2/O2/treatment plant additives/carbonic acids. In a tank that holds a certain pH level with it's carbonic acids, increased WCs can result in a slightly higher pH. A gradual increase in tank pH to the degree that you're seeing is usually indicative of an increase of alkalinity (KH). Pulling driftwood out or removing any other source of acids including any of your additives that might contribute can do it too.

Make sure you are seeing high KH out of the tap before you go peat shopping, that'll verify a reason for the action. test it yourself with a liquid KH reagent, don't have the LFS do it or answer whether or not they think it's hard or soft, ask here. One person's answer is questionable and they will likely try to sell you something to change it, something unnecessary or even harmful. It's not so complicated that we need anything an LFS sells to fix it, if it were even a problem.


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post #9 of 9 (permalink) Old 11-30-2007, 09:04 PM
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One more thing, you're about 100 miles SW of me, I figure there's a decent chance you might be interested in the ammonia, nitrite and nitrate levels of your tap water. Things change up quick around here and it's not uncommon to suddenly find those coming through at pretty high levels. Explains a lot of mysterious events once/if you realize it's happening. Ultimately, I ended up getting an RO/DI so I could keep the reef going. Good stuff for plants though, makes a difference in dosing.


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