What could cause pH drop? - New to Planted Aquariums - Aquatic Plant Central

Go Back   Aquatic Plant Central > Welcome Forums! > New to Planted Aquariums

New to Planted Aquariums Don't know where to begin? Find your answer here.

LinkBack Thread Tools Display Modes
Old 03-16-2006, 11:14 PM   #1 (permalink)
Join Date: Feb 2006
Posts: 29
iTrader Ratings: 0
karen99 is a regular member
Default What could cause pH drop?

Is there anything that could cause pH to drop from 7.8 to about 6.8 in a day?
The tapwater here is 7.8. The tank's pH was 7.8 for a week or so with diy CO2. Then one day it was suddenly around 6.8-7.0.
I suspect the pH drop killed three of my fish. Some of my other fish appeared extremely stressed after the pH drop and seem to be slowly adapting and recovering now. I've been doing very small waterchanges with aged tapwater which is slowly bringing the pH back up.
But I am curious as to what the reason could be for the pH drop, so I can avoid it in the future.
karen99 is offline   Reply With Quote

Advertisement [Remove Advertisement]
Old 03-16-2006, 11:34 PM   #2 (permalink)
Senior Member
Laith's Avatar
Join Date: Sep 2004
Location: Geneva, Switzerland
Posts: 2,307
iTrader Ratings: 0
Laith is a valuable member of the community Laith is a valuable member of the community

One possibility is CO2 injection into a tank with extremely low KH (less than 2 or 3). Since the KH buffer is so small, the pH can suddenly drop significantly.

Check your KH, even if it's normally higher than 2 or 3. Sometimes the water company suddenly uses another source of water with completely different parameters. Here sometimes the water utility will not have enough liquid rock water from streams and wells so they suddenly start using lake water: KH goes from 15 to 4-5 (I wish they'd stick with lake water!!). I learned of this the hard way when I was using a pH controller and not regularly checking KH.

I can't really think of anything else that it can be, other than a bad test kit/pH probe...
Laith is offline   Reply With Quote
Old 03-17-2006, 01:16 PM   #3 (permalink)
Senior Member
JanS's Avatar
Join Date: Apr 2004
Location: Hibbing, Mn. USA
Posts: 6,352
iTrader Ratings: 5
iTrader Positive Rating: 100%
JanS is a valuable member of the community JanS is a valuable member of the community JanS is a valuable member of the community

I wonder if your DIY bottle suddenly dumped in the tank to drop it that fast.

Did the room temp get higher than usual to make the yeast react faster?
JanS is offline   Reply With Quote

Aquatic Plant Central > Welcome Forums! > New to Planted Aquariums > What could cause pH drop?

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Similar Threads
Thread Thread Starter Aquatic Plant Forum Replies Last Post
Co2 ppm Calculations with only pH wguttrid General Aquarium Plants Discussions 9 04-04-2006 07:05 PM
ADA AquaSoil How Low to keep PH / Add Ferts? alexperez Substrates 21 09-20-2005 05:43 AM
pH is up to 9! Ways to drop it? Jaap New to Planted Aquariums 7 07-25-2005 06:55 PM
PH Drop trenac General Aquarium Plants Discussions 7 07-24-2005 10:36 AM
Methods of altering pH timdz General Aquarium Plants Discussions 6 04-24-2005 04:05 PM

All times are GMT -8. The time now is 11:13 PM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

Search Engine Friendly URLs by vBSEO 3.6.1