Aquarium PH suddenly higher than tap water

Discussion in 'pH' started by ripley, Jul 11, 2015.

  1. ripleyNew MemberMember

    Hi all, I have a 75 gallon fresh water tank with 4 silver dollars, 2 gouramis, 2 pictus catfish, 6 nerite snails, and 3 apple snails. All the fish are about 2 inches. My tap water ph is 7.2 and my aquarium use to be about 7.6. I just tested it today and the aquarium ph is now 8.2. What could have happened? Is this a problem for my fish? The only thing I changed was adding a few (about 10 small stalks) of plants - I don't know what they are, they look similar to grass and two moss balls. I read that plants might raise the PH by absorbing CO2. I thought the plants would be a good thing for the nitrogen cycle - I'm confused. Any advice is greatly appreciated - Thanks!
  2. Dom90Fishlore VIPMember

    What are your water parameters? Can you also test the KH and GH? Low readings can cause fluctuations in pH.

    Sent from my iPhone using Fish Lore Aquarium Fish Forum
  3. ripleyNew MemberMember

    Ammonia = 0
    Nitrite = 0
    Nitrate = 15
    We have extremely hard water and the kh and gh are off the scale. The ph has always been stable around 7.6 until now. I did a very large water change (about 75%). Afterwards the water was cloudy which has never happened before either. After about a day and a half it was very clear and clean. I wonder if maybe something happened to the well water during that time? We had run a lot of water just prior to my filling the aquarium. Could it be that the water was very low in the well so that caused a change?
  4. Sarcasm IncludedWell Known MemberMember

    There are dissolved gases in tap water that will separate over the first hour or so, resulting in PH change. It isn't really that significant unless you are doing very large water changes. If that is the case, you should put first half of the replacement water in buckets to "age" or gas off.
  5. ripleyNew MemberMember

    Thanks for the replies. I think I'm going to do another water change and see if that brings it back down. I didn't know about the dissolved gasses. Appreciate the responses - thanks!
  6. AquaristFishlore LegendMember



    Information in the link above that you may find helpful somewhere down the road if not now. :)

    Ken (thread moved to Aquarium Water/pH section of the forum)
  7. ripleyNew MemberMember

    Wow - looks like a lot of very good info there. I just read the part about accurately testing tap water after agitating and letting it sit. I'm going to try it. Thank you!

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