I have a ten gallon planted tank with 3 guppies (and a snail that hitchhiked). I just added the guppies 2 days ago. Back when I was still cycling I added an extra bag of gravel and the Ph shot up to 8.2. Because my tap water has 7.6 Ph it was slowly comming down with water changes. However, I just tested it again and got this:
What made it come back up?? The only thing different lately is I added fish... But that shouldn't do anything to Ph. I know that livebearers like more basic water but 8.2 seems a little high.
On another note, I just added 3 guppies and my biological filter and plants are handling it with flying colors. Is it safe to add another 3 guppies? If not when do I know when it is safe to add more?
Thanks in advance :-D
What kind of rocks did you add? Calcareous rocks will raise your pH, this would be things like crushed coral, aragonite, or similar. They will continue to 'dissolve' minerals forever until gone.
However, a pH of 8.2 is nothing to worry about with these fish. A perfectly neutral 7.0 is actually extremely abnormal in nature. The important thing is stability. You don't want the pH swinging by a large amount. pH will often change a little throughout the day, but not by a large amount in a healthy system. Be sure you test at the same time every day because of that.
As for adding fish, I would wait at least 2 weeks, if not 4 weeks, before new additions. This is assuming the new fish were not quarantined as most people don't.
Even if quarantined, I'd wait 1 week minimum. You want to give the tank time to adjust and to ensure no ammonia/nitrite is forming.
Ok, I'll wait longer to add more fish,
Thanks for the feedback
you c an try a viegar test on the rocks and décor you have in the tank. if it fizzes when vinegar is poured on it then it messes with ph.
I would re-test your tap water. Assuming you tested it yourself, you may not have out-gassed the CO2, and this will give an incorrect (and lower) reading. To out-gas the CO2, let a glass of tap water sit for 24 hours, or place some in a jar and shake it very briskly for a few minutes. Then test. You may find the tap is closer to 8.2 in fact.
Regardless of that, as someone mentioned the livebearers will be fine in harder water with a higher pH. Soft water fish would be a very different story.
Edit: I just realized that as well as adding fish I have also kept the air pump much longer every day.. Your post on Co2 gassing out reminded me of that. Thats probally why my Ph went back up.
Simple.. the plants are reducing carbon dioxide which raises pH.
Very common in planted tanks. In fact with my non filtered, no circulation tanks those values are normal and expected.
IMHO it is hardly dangerous to the fish to have a low co2 environment.
you have this revers, ph lowers not raises :P
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