Ca and Mg equation - The Planted Tank Forum
 
LinkBack Thread Tools Display Modes
post #1 of 10 (permalink) Old 06-23-2019, 04:22 PM Thread Starter
Algae Grower
 
PTrader: (0/0%)
Join Date: Dec 2018
Posts: 36
Ca and Mg equation

If we know the GH and the Ca we can find the Mg from an equation. My question is.. If i raise my calcium, my magnesium automatically is getting lower??
fitos100 is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old 06-23-2019, 04:32 PM
Planted Tank Guru
 
Seattle_Aquarist's Avatar
 
PTrader: (64/100%)
Join Date: Jun 2008
Location: Seattle, WA
Posts: 6,291
Hi @fitos100,

If you increase the calcium the dGH will increase assuming that the Mg remains the same.

Roy_________
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

75 Gallon, 2X55W AH Supply CF 8800K, 1XFluval F&P 2.0; 45 Gallon Tall, 96Watt AH Supply CF 6700K; 30 Gallon Long; Fluval F&P 2.0; 20 Gallon, 1X26W AH Supply LED; all with CO2 and (Calcined) Montmorillonite Clay
Seattle_Aquarist is online now  
post #3 of 10 (permalink) Old 06-24-2019, 03:57 AM Thread Starter
Algae Grower
 
PTrader: (0/0%)
Join Date: Dec 2018
Posts: 36
yes you are right. stupid question.
fitos100 is offline  
 
post #4 of 10 (permalink) Old 06-25-2019, 11:51 AM Thread Starter
Algae Grower
 
PTrader: (0/0%)
Join Date: Dec 2018
Posts: 36
another question came up. When I prepare my water change I fill seven 20lt bottles mix RO and tap water. I tested one of the bottles and i found Ca 20 ppm. So when I'll change my tank water I'll have 720 ppm of Calcium adding in my aquarium?? Because I test my tank and I found Ca 17.5 ppm.
fitos100 is offline  
post #5 of 10 (permalink) Old 06-25-2019, 01:31 PM
Wannabe Guru
 
PTrader: (17/100%)
Join Date: Jan 2011
Location: TN
Posts: 1,823
The percentages stay the same.

Getting back to the hobby and up to speed.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Rainer is offline  
post #6 of 10 (permalink) Old 06-25-2019, 01:41 PM Thread Starter
Algae Grower
 
PTrader: (0/0%)
Join Date: Dec 2018
Posts: 36
I don't speak for percentage. I speak about the actuall amount of Ca. If I have 20 ppm calcium in each bucket of my water change, then with wc I add 140 ppm in my tank at the end or only 20 ppm???
fitos100 is offline  
post #7 of 10 (permalink) Old 06-25-2019, 01:56 PM
Planted Tank Enthusiast
 
PTrader: (0/0%)
Join Date: Feb 2018
Location: Maryland
Posts: 759
if you put 2 buckets of 20ppm together you still have water with 20 ppm. so say thats .5g of calcium if you double the water you would have 1g total of calcium but still 20ppm as the water volume has doubled it's still the same concentration.
unless half of it evaporated then you would have 40ppm minus whatever caked onto the sides of the container where the waterline dropped. but to raise the ppm you need to increase the calcium in the same volume of water, adding more of the same water will keep you around 20 ppm, unless you are just letting water evaporate off and topping off... then it will slowly raise (minus whatever is actually consumed in the tank by plants or whatever)

If you keep pouring in 20ppm it will slowly move the starting value towards 20ppm...
Wobblebonk is online now  
post #8 of 10 (permalink) Old 06-25-2019, 10:38 PM Thread Starter
Algae Grower
 
PTrader: (0/0%)
Join Date: Dec 2018
Posts: 36
Thank you very much for the answer.
So the same apply with NO3? If I measured 2 ppm in one of my buckets then the same amount of NO3 it will be in my tank after the water change??
fitos100 is offline  
post #9 of 10 (permalink) Old 06-26-2019, 12:42 AM
Planted Tank Enthusiast
 
PTrader: (0/0%)
Join Date: Feb 2018
Location: Maryland
Posts: 759
Yes same deal...
PPM is a percentage btw so saying you are talking total amounts in ppm and not percentages makes no sense.
1 PPM == 1/1000000 1% == 1/100...
Wobblebonk is online now  
post #10 of 10 (permalink) Old 07-04-2019, 02:07 PM
Planted Tank Guru
 
Seattle_Aquarist's Avatar
 
PTrader: (64/100%)
Join Date: Jun 2008
Location: Seattle, WA
Posts: 6,291
Quote:
Originally Posted by fitos100 View Post
another question came up. When I prepare my water change I fill seven 20lt bottles mix RO and tap water. I tested one of the bottles and i found Ca 20 ppm. So when I'll change my tank water I'll have 720 ppm of Calcium adding in my aquarium?? Because I test my tank and I found Ca 17.5 ppm.
Hi @fitos100,

@Rainer is correct, the amount of Ca will remain at 20 ppm.

Roy_________
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

75 Gallon, 2X55W AH Supply CF 8800K, 1XFluval F&P 2.0; 45 Gallon Tall, 96Watt AH Supply CF 6700K; 30 Gallon Long; Fluval F&P 2.0; 20 Gallon, 1X26W AH Supply LED; all with CO2 and (Calcined) Montmorillonite Clay
Seattle_Aquarist is online now  
Reply

Tags
None

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










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