Water Change - The Planted Tank Forum
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post #1 of 8 (permalink) Old 03-18-2018, 11:51 PM Thread Starter
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Water Change

I have a planted tank with co2 pressurized. I have noticed my fill water has high ph of 8.0, should I do small water changes, with api ph down? I like keeping my 6.6..thanks

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post #2 of 8 (permalink) Old 03-19-2018, 12:32 AM
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Id never use chemicals to adjust the ph. not good for plats not good for fish. To minimize the ph swing during water changes you can do them after the photoperiod/co2 is off and the ph will naturally be higher than during the photoperiod/when co2 is on. this happen naturally in streams, rivers and lakes as well if plants are photosynthesizing during the day. If you cant do them at night you can do wc more slowly during the photoperiod to reduce the rate of change of the ph swing. BUT as long as your kh is decent then your ph wont swing that rapidly and your fish will be probably be fine.
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post #3 of 8 (permalink) Old 03-19-2018, 12:45 AM
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Originally Posted by bill.marshall.94 View Post
I have a planted tank with co2 pressurized. I have noticed my fill water has high ph of 8.0, should I do small water changes, with api ph down? I like keeping my 6.6..thanks

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I don't know of a single person here who uses API pH down.

If your degassed pH is 8.0, you could just drop the pH with CO2. That would be a 1.4 pH drop.

Or if you go with a 1.2 pH drop, you would be at 6.8.

But the bigger question is why you want to be at 6.6 pH?? Any number somewhere in that range should be good for about anything.


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post #4 of 8 (permalink) Old 03-19-2018, 01:46 AM
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Originally Posted by bill.marshall.94 View Post
I like keeping my 6.6..thanks
I have to ask the reason for 6.6 before I would even reply.
What are you growing? GH & KH could be of concern also?


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Growing is not that difficult.
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post #5 of 8 (permalink) Old 03-19-2018, 02:42 AM
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i keep amazonian fish so i have to keep my pH low. anywhere under 7 is good for me, but i use seachem pH controller, and you said that's bad? how?
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post #6 of 8 (permalink) Old 03-19-2018, 02:28 PM
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i keep amazonian fish so i have to keep my pH low. anywhere under 7 is good for me, but i use seachem pH controller, and you said that's bad? how?
The problem is related to the buffering of the water. How much buffering will change how much PH swing you get. The problem with any method like PH down is that it is so temporary if there is a lot of buffering. Fish tend to be better with stable conditions as they can adapt over a wide range but not if it is swinging up and down with each water change or chemical addition. So many of us go with the idea that the fish can adapt far better than the constant stress of chasing a moving target.
Some reading on how buffering fits in your tank may help? I find PH is not very important in my African cichlid breeding but I do have lots of buffering. We often read about PH as being critical but I find it is just a portion of the whole question and certainly not the most important one.
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post #7 of 8 (permalink) Old 03-19-2018, 10:54 PM
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id my pH is 7 or higher, i cant keep plecos, rams and hatchets alive. My water changes are large and often with a dash of the pH stuff. I dont use too much of it, i mainly use it as a dechlorinator.

Bump: However i dont exactly need the pH chemicals, as my tap water is fairly low, a bit over 7. Im able to keep it low enough with botanicals. I use the seachem just in case
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post #8 of 8 (permalink) Old 03-20-2018, 04:16 AM
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Ahh! My first chance to link to someone who explains everything way better than I can ever hope to.

https://www.advancedplantedtank.com/ph-kh-gh-tds.html

Man.. this guy just reduced the time I spent on my replies by 95%!


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