Excel, glutaraldehyde question - The Planted Tank Forum
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 02-11-2014, 04:00 PM Thread Starter
Planted Tank Enthusiast
micheljq's Avatar
PTrader: (0/0%)
Join Date: Oct 2012
Location: Quebec
Posts: 963
Excel, glutaraldehyde question


If I dose Excel, or Metracide. Should i see the pH fluctuate just like when we inject CO2? but to a lesser level?

Thank you, Michel.

Plants and algae grower.
micheljq is offline  
Sponsored Links
post #2 of 5 (permalink) Old 02-11-2014, 04:45 PM
Planted Tank Guru
Zorfox's Avatar
PTrader: (5/100%)
Join Date: Jun 2012
Location: Gainesville, FL
Posts: 2,105
From Seachem's website.

Q: Is it better to add Flourish Excel at night or in the morning based upon plant carbon uptake physiology?

A: Carbon intake is a function of photosynthesis. Based on this, it would be ideal to dose Flourish Excel during the day. But given that Flourish Excel can stay complexed as a carbon source for up to 24 hours before it dissipates, you can dose at any time of the day and the product will be available for the next 24 hours. Flourish Excel is not carbon dioxide and there is no impact on pH using Flourish Excel.
Zorfox is offline  
post #3 of 5 (permalink) Old 02-11-2014, 04:47 PM
Planted Tank Enthusiast
jfynyson's Avatar
PTrader: (15/100%)
Join Date: Apr 2013
Location: NC
Posts: 879
No, you should not be dosing nearly enough to affect the pH and even still you should have enough buffering capacity to mitigate a pH swing.
jfynyson is offline  
post #4 of 5 (permalink) Old 02-11-2014, 05:23 PM Thread Starter
Planted Tank Enthusiast
micheljq's Avatar
PTrader: (0/0%)
Join Date: Oct 2012
Location: Quebec
Posts: 963
Thank you for the answers

Plants and algae grower.
micheljq is offline  
post #5 of 5 (permalink) Old 02-11-2014, 05:33 PM
Planted Tank Guru
DarkCobra's Avatar
PTrader: (5/100%)
Join Date: Jun 2004
Location: Baton Rouge, LA
Posts: 3,350
No, you will not see a measurable pH change at all, as glutaraldehyde does not release CO2 in the water.

Glutaraldehyde is actually a toxin. Which occurs naturally as a by-product of various metabolic processes, so all living things in your aquarium have protective mechanisms against reasonable amounts of it.

Once glutaraldehyde enters any cell, these mechanisms immediately start breaking it down to render it harmless. Plants break it down into a form carbon they can use. Whether it's actually CO2, or some other form of carbon, is unknown. But as this occurs only within cells, the carbon is produced and used there, and never released into the water in significant amounts. So no pH change.

Glutaraldehyde is only shelf stable in an acidic solution. A bit of acid is added to Excel, Metricide, and so on, so that it doesn't expire quickly. This is why when premixing a diluted solution of any of these products, only distilled water should be used; if high-pH tapwater were used instead, the glutaraldehyde would start breaking down immediately, and lose most of its potency in a few weeks. A few people have made the mistake of adding Excel until they see a pH change, expecting it to be caused by CO2. But this is due only to the acid component, and they've really added a massive and harmful overdose.
DarkCobra 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:


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

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