I setup my new aquarium for a week now.
100L (80x32x40 cm), 2x 24 W light, filtering 650L/h
Substrate: JBL Aquabasis, JBL Manado.
CO2 - JBL Bio 160 running day and night.
7 types of plants, 4-5 of them already started to grow.
No fish yet as i`m still cycling.
I bought yesterday a PH tester (6-7.6 range). I proceeded to test the water.
yesterday evening Aquarium water PH value was: 7.6-7.8.
measured the tap water that I put into the Aquarium: 7.0
This morning the Aquarium water PH value was again: 7.6
I don`t get it. Even though the CO2 was running all night and the plants did not use it, the PH did not drop at all.
Why did the PH in my aquarium rise from 7.0 (tap watter) to 7.6-7.8?
Any thoughts on this?
Your pH can become unstable when completing a fishless cycle due to the high levels of ammonia. Other things that could also cause changes in your pH are certain types of substrates meant for marine set-ups and certain types of rocks. Another factors could be the amount of CO2 in your tap water. Perhaps you could take a sample of tap water, test the pH, then let this same sample sit for 24 hours allowing all the CO2 gas off and then test the pH again.
Last edited by Cliff; 11-07-2013 at 01:58 PM.
If you take your time to do the research FIRST, you can successfully set-up and keep ANY type of aquarium with ease.
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Fishless Cycle Cycling with Fish Marine Aquarium Info
the most simple answer is Co2 releases carbonic acid in the water and decreases ph. If you would like to get a little more technical, check this out
As has been mentioned, out-gassing the CO2 from your tap water may be needed to accurately determine the pH of the tap water. As Cliff said, let a glass of tap water sit overnight, or alternatively shake some very briskly in a covered jar for a couple minutes before testing. This will tell you/us if the aquarium pH is remaining the same as the tap, or if it is rising.
I would also find out the GH and KH of your tap water; you can get this (or should be able to) from the municipal water people who may have a website with water data posted. The KH in particular acts as a buffer preventing the pH from fluctuating. I wrote an article on the relationship of hardness and pH a couple years back, and will post it if you ask.
Sorry for not being exact in my previous post. I was testing the water that I put aside for dechlorination in bucket. That water has 7.0 (Water was put in there for over a week now).
As I mentioned in my other post (fish compatibility subforum) my GH is 2.14 german degrees.
KH not specified.
Byron makes a good point by asking if you have any rocks as decorations in your tank? If you do and are not sure what kind, simply remove them and pour white vinager over them, if they bubble up than the rock is calcareous and should not be used unless you want your pH to raise.
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I mentioned that my substrate is JBL Aquabasis, and JBL Manado (some kind of light vulcanic neutral rock - it`s porous).
The rocks were tested prior to puting them in the aquarium with vinegar. No bubbles. I looked for them myself in the mountains nearby. These mountains are not calcarous. They are sediment rocks (easile breakable - you can see the layers of sediments in them). Pictures of them are available in my other thread. So I don`t think they are the cause.
It can be the cycling, with the ammonia. That is the only thing that would make sense.
I put 2-4 flakes (fish food) per day in the tank.
There are also some dead leaves from my plants (one of than seems to have troubles accommodating to my tank, so there are plenty of those).
I`m not adding Ammonia solution if that`s what you`re asking. I`m doing it the natural way :)