KN03 - The Planted Tank Forum
 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old 08-12-2003, 03:35 AM Thread Starter
Planted Member
 
rossi32s's Avatar
 
Join Date: Feb 2003
Location: On the net usually
Posts: 266
If i am dsoing prilled KNO3 and paying attention to the nitrate levels should I assume that my Potasium levels will be in the range needed?

KNO3 - Potassium Nitrate K - Potassium 38.7%
NO3 - Nitrate 61.3%


THanks
Scott
rossi32s is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 08-12-2003, 08:38 AM
Algae Grower
 
Perrush's Avatar
 
Join Date: Jul 2003
Location: Belgium
Posts: 33
Send a message via MSN to Perrush
No.

K can be dosed by K2SO4

--
English isn't my native language, but I guess you already noticed that :-)
--

Perrush
Perrush is offline  
post #3 of 8 (permalink) Old 08-12-2003, 04:52 PM
Are these real?
 
Wasserpest's Avatar
 
Join Date: Jun 2003
Location: Monterey, CA
Posts: 15,494
From what I have read, the Potassium provided by KNO3 is not enough to reach the "optimum" 20 ppm level. Also, when you get a higher fish load, you will dose less NO3, but still need the same amount of K.

Having said that... If your plants look healthy and you don't have other (algae?) problems, I would hold off with K2SO4.

If you start to see holes developing in older leaves (in swords, for example) you might want to start looking for K2SO4.
Wasserpest is offline  
post #4 of 8 (permalink) Old 08-12-2003, 04:57 PM Thread Starter
Planted Member
 
rossi32s's Avatar
 
Join Date: Feb 2003
Location: On the net usually
Posts: 266
since i am starting to dose from dry ferts... how do i test for Potassium?

I read that potasium is not a danger fert so is there a rule of thumb for dosing it?

Scott
rossi32s is offline  
post #5 of 8 (permalink) Old 08-12-2003, 05:12 PM
Planted Tank VIP
 
KyleT's Avatar
 
Join Date: Jul 2002
Location: Austin, Texas
Posts: 13,533
http://www.csd.net/~cgadd/aqua/art_p...osage_calc.htm

Scott if you click on that link it will tell you how much to dose for your size tank. There really is no need to test for potassium because it really isn't very lethal until you get to obsurd concentrations.

The easiest way to get some is to go to your local garden store and ask for "Muriate of Potash". Almost every garden store carries it, it is pure K20.

Kyle

Please Send all Support Requests to forumadmin
Bit Of Nothing - Personal Blog
KyleT is offline  
post #6 of 8 (permalink) Old 08-12-2003, 05:13 PM
Are these real?
 
Wasserpest's Avatar
 
Join Date: Jun 2003
Location: Monterey, CA
Posts: 15,494
You can't really test for Potassium. Just take Chucks calculator, plug in 1 ml water, your tank size, and then play around with the teaspoons and see how many you need to get to 20 ppm.

After a gradual initial addition to bring it up to that level you will be dosing just for the water that you change.
Wasserpest is offline  
post #7 of 8 (permalink) Old 08-13-2003, 07:34 PM
Newbie
 
Join Date: Aug 2003
Location: Glasgow
Posts: 1
Quote:
Originally Posted by Wasserpest
You can't really test for Potassium. Just take Chucks calculator, plug in 1 ml water, your tank size, and then play around with the teaspoons and see how many you need to get to 20 ppm.

After a gradual initial addition to bring it up to that level you will be dosing just for the water that you change.
I'm really confused now. On Chuck's site it says "this is the total level you should target for the tank. For nutrients like Potassium and magnesium, I add enough so that each week, I'm adding close to this amount." I was assuming that you start from scratch each week - so that in my 50 gal tank, for instance, I would add around a teaspoon of K2SO4 every week, which would add around 15 ppm of potassium. Which is correct? Do you add enough for the whole tank each week, or just enough for the water you're replacing? If you just add enough for the water you're replacing, that seems to suggest that your plants aren't using up what you put in the tank the week before.
newtankgirl is offline  
post #8 of 8 (permalink) Old 08-13-2003, 08:16 PM
Are these real?
 
Wasserpest's Avatar
 
Join Date: Jun 2003
Location: Monterey, CA
Posts: 15,494
For potassium, you don't dose for the whole tank each week. That would lead to a steady increase of chemicals in your tank. You can not assume that the plants take up all the nutrients supplied, and since you can't measure it, to be on the safe side you only add enough to bring the replacement water to the desired level.

For NO3 (KNO3-dosing) you should monitor and dose according to your tank level. Fish poop and decaying plants all add to the NO3 level.
For example, if your test kit says 0, you should dose for the entire tank, to bring it to 5 ppm. But you need to be careful and do this gradually, since sudden changes in water chemistry can be harmful for your fishies. Plus the testkits I tried are not very precise in lower levels, between 0 and 10 ppm.
Wasserpest is offline  
Reply

Quick Reply
Message:
Options

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

Password:


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

Email Address:
OR

Log-in









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
KN03! WfxXx General Planted Tank Discussion 9 02-26-2004 03:27 PM

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