Nitrite

Okay, first the pH buffer will only end up causing you issues unless you are constantly on top of it. Either way it is unneccessary in 99 out of 100 situations.

The pH is probably setteling back to it's normal range (test your tap water after letting it sit out for a day to compare - It will probably ready ~7.2). Because the pH buffer releases over time (heavy at first that slowly dissipates over the life of the product), the pH will never be stable.

Q 1: In your case they are not related. It's the Buffer you used that is no longer affective that is causing your pH rise.

Q 2: Yes. A tank is never actualy "over". Simply, ammonia is converted into nitrItes and rItes into nitrAtes. NitrAtes are the end product, and will constantly increase in a tank until they are removed either by a water change or from plants.

As each bacteria is developed and colonized in a tank, this process becomes more prevelant. Ammonia is "cycled" into nitrItes 1st, and when the bacterias are sufficient to do so in a balanced system ammonia is converted over before it can build up in the system. The same is true when the nitrifcating bacterias are sufficient for converting nitrItes in nitrAtes. However, this last stage is much slower and thus we often see both nitrItes and nitrAtes present in a cycling tank.

The good news is that this is an indicator that the cycle is nearly balanced with the fish present. However, the reason most LFS caution in only adding a few fish every 2-3 weeks is b/c every time you introduce more fish to a newly cycled tank (ie. a larger bioload and thus more ammonia), the "cycle" must rebalance itself. If done slowly, there is little to no adverse impacts to the balance,. However, if deon too fast or by introducing too many fish this can cause what we call a mini-cycle (a spike in the ammonia and/or nitrItes).

Hope this helps!
 
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That was super helpful, thanks so much. So now I am assuming I need to phase out the buffer, but how? Especially in a tank that is toxic for the moment?

Sorry about double post, trying to figure out how to get rid of it.
 
Considering that your pH is currently at 7.2, and probably stable or nearly so, I would simply leave it alone. The dramatic rise from 6 to 7 has already occured, and intoroducing the buffer back will equally cause a dramtic lowering of the pH. Thus I would simply forget about it, but keep monitoring it for any sudden changes incase it is being affected by someting else as well (ie. driftwood can do this, crushed coral, peat, etc.)

As for the tank itself, simply keep your ammonia and nitrItes well below 0.25ppm and you should do fine.
 
The saga continues...

I went out today and bought the API Freshwater Master Test Kit. The readings I got were through the roof - amonia 2, nitrite 5, nitrate 5, ph 7.8 (maybe I did them wrong?). I did a 20% water change last night. I have done 2 pwc since then with gravel vacs and cannot get the amonia lower than 1.

I started this tank with 3 zebra danios and a cory cat. After I was told the tank had cycled, I added 2 more danios. Two weeks later I added an otto. Am I over-stocked? Sorry to post so much but this is upsetting and I don't want to loose any fish.
 
I would do atleast 2 more 50%+ water changes..... typically a 50% change if you are showing 1ppm should get you down .50ppm .....then the next 50% one should get you to .25ppm. But if it were me I would do two more pwc of atleast 75% to be on the safe side ...then test and see what you have.

Once you get your readings low you will need to test daily and do pwc acording to the results...in some cases this could mean doing two a day to keep things in check until your cycle gets finished.

Good luck !!
 
Oh...I dont think you ever mentioned what size tank you have

If it is 20g + I hope you have a Python to make the changes easier ...
 
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