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Old 08-11-2009, 12:03 PM   #1
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Angry pH Won't go Down!

Hi!

I have a 20-long with six fish each about an inch long - platy, swordtail, danio (lost the other five to fish TB), two angelfish, and a female guppy.

The pH has been high, like 7.8, and the alkalinity is off the test strip scale. Our water softener is terrible, it has zero hardness and high pH, and our outdoor water is hard, high pH, and spring water from the store is about the same.

pH Down won't work, I can't find peat moss.

Please help me!

~Humdedum
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Old 08-11-2009, 12:12 PM   #2
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Perhaps dilute HCl? AND I MEAN DILUTE! And that will only bring it down temporarily... Sounds like the tank needs a good clean. The water to start with is alkaline so you need to start with as clean a platform as possible. 7.8 isnt horrible. Mine is 7.6.
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Old 08-11-2009, 12:40 PM   #3
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We've cleaned the gravel.. WC....
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Old 08-11-2009, 04:20 PM   #4
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7.8 isn't that high for most community fish. I've even kept discus and apistogramma in 7.8. If it's stable, I'd say don't try to change it. Stability is more important than a "perfect" number. Good luck!
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Old 08-11-2009, 05:17 PM   #5
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I agree that 7.8 is not a bad number. Fish will aclimate to different PH ranges usually (imo). I found a nice article that explains PH here. Aquarium pH - The First Tank Guide - What About Adjusting the pH in My Aquarium? It calmed me down alot, our tap water is 8.0 to 8.2. The driftwood in my tanks keeps my PH around 7.8 or so.
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Old 08-11-2009, 06:53 PM   #6
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I agree with not messing with the pH! 7.8 is really not that bad & is perfectly fine for your fish. Trying to adjust that will only cause pH swings & more problem.

<FYI - the only way you can change your pH reliably is to use a deionizing/reverse osmosis unit & add a neutual buffer to the R/O water. But as I said before, you don't need to do it!>
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Old 08-11-2009, 08:51 PM   #7
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pH Will not Go Down!! - FishForums.com

This is the best description of what's going on.
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Old 08-11-2009, 11:36 PM   #8
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As already stated, you don't have to adjust your pH. However, if you were interested in how you would lower the pH, you would most definitely need to lower your KH, which is keeping your pH in the alkaline range. KH measures the buffering capacity of the tank, which is the resistance to pH swings. The more buffering capacity the more acid can be added with no effect.

One of the best ways to get your KH where it needs to be before you start messing with the pH is to mix purified water with your tap water. The purified water can be reverse osmosis (RO), deionized, distilled, spring water with a low GH and KH, etc. I'd let the pH stay where it is if I were you. It's not going to hurt anything at all sitting at 7.8
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Old 08-12-2009, 12:04 AM   #9
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I must warn against lowering your pH. Its only worth it if you are trying to breed species that are picky on pH. Ive got a pH of 6.6 right now but I have to keep adding a small amount of buffer regularly to prevent my alkalinity from bottoming out as it would if left unchecked. Its meticulous at times and can be a deadly game. Unless your trying to breed some tough species its best to leave it be. My other tanks sit at a 7.9 and all my fish are happy as can be.
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Old 08-12-2009, 12:11 AM   #10
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why are you so worried about changing it?
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