High PH, high GH, low KH, dumb goofy water - The Planted Tank Forum
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 07-25-2004, 05:10 AM Thread Starter
Join Date: Mar 2003
Posts: 4
High PH, high GH, low KH, dumb goofy water

Greetings all:

I would like to know why my tap and tank water differ. I'm sure theres a reason, I just need to be educated

Tap - PH 8.8, GH 161, KH 143

Tank - PH 7.4, GH 179, KH 53.7

Tank is an established 46g bowfront.

Artificial gravel, emperor 400 and Magnum 250.

I pre-treat my tap water with Tap Water Conditioner, thats it.

Every few days I do a 10-25% water change.

Inhabitants: A few angels, a couple large headlamp tetras, 5 red fin tetras, a pair of ADF's, a zillion trumpet snails, 4 amazon swords and a few other plants that I'm not really sure what they are.

So my question is, why is the PH and KH so much lower in the tank than from the tap?

tomanystraydogs is offline  
Sponsored Links
post #2 of 5 (permalink) Old 07-25-2004, 06:38 AM
Wannabe Guru
ninoboy's Avatar
Join Date: Jan 2004
Location: Las Vegas , Nevada
Posts: 1,261
Is there anything other ornaments in the tank that may release acid (driftwood, peat)? In the past maybe? If none, do a 60% water change and check the KH on the next day. After that, check the KH again a few days after and see whether it held constant.

Eheim Pimp #21 (2) 2028 and auto feeder
ninoboy is offline  
post #3 of 5 (permalink) Old 07-25-2004, 03:15 PM
Are these real?
Wasserpest's Avatar
Join Date: Jun 2003
Location: Monterey, CA
Posts: 15,523
Regarding the pH... fill a glass with tap water, then let it stand overnight and take the pH afterwards. My water comes out of the tap 8.0, and goes down to 7.6 after a few hours.

Regarding the kH, I am not sure... there are a few guesses, like Nino mentioned, anything leaching humic acids, or if you use peat in your filter, also natural processes in the tank will lower kH over time.

Regular water changes should keep it fairly even.
Wasserpest is offline  
post #4 of 5 (permalink) Old 07-25-2004, 04:25 PM Thread Starter
Join Date: Mar 2003
Posts: 4
Thx 4 the reply.

I should have also mentioned I am not complaining about the lower PH, I like it, just wondering why it happens.

I do have a slab of granite in there, but that should have no affect.

I'm the first owner of the tank.

I have run the emperor with carbon before, don't think that would do it.

Can I rule out organisms (fish, plants, snails) affecting PH?
tomanystraydogs is offline  
post #5 of 5 (permalink) Old 07-25-2004, 06:18 PM
Wannabe Guru
Join Date: Dec 2003
Location: USA
Posts: 1,740
There seems to be no problem with your GH, as that stays fairly constant. Your pH and KH on the other hand is a different case.

Basically, pH and KH are directly related: as one goes up, the other goes up and vise versa. In most cases though, KH runs the show and controls pH. In your case, there is some kind of acid that is using up a huge amount of your KH buffer, or simply something is doing a type of resin exchange (like peat). How often do these changes occure from tap to tank? Again, test the pH and KH of your tap after it has rested for 24 hours.

You cannot rule out the fish in this matter since they produce acids that eat away at kH and lower pH. Is this tank really overcrowded...or does it have big fish?
Rolo is offline  

Quick Reply

Register Now

In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
Here's a great how to lorax Riparium/Terrarium/Vivarium 3 06-09-2009 12:24 AM
fish deaths and ich problems???? cvarcher Fish 18 05-18-2007 01:17 PM
ultrasonic foggers? Anonymous Riparium/Terrarium/Vivarium 44 06-08-2004 07:20 AM
The Potential Importance of Tank Depth on Light Attenuation Splash Lighting 25 03-26-2004 07:41 PM
UPDATE on high pH and hard water hubbahubbahehe Fertilizers and Water Parameters 3 12-02-2003 06:32 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome