What is the relationship between Ca and Mg in the planted aquarium and will the presence, or lack of, one influence the level of the other?
Thanks
André
Thanks
André
Well I was finally to check my waer chemistry today. TDS from Hanna meter and Ca levels from Salifert testBert H said:Dennis, I am curious if you have ever determined how much of your gh is from Ca vs Mg? In my case I have a gh of 11, and kept seeing curling stunting on and off on my A. reinickii. So I bought a Ca test kit and found most of my gh came from Ca. I started adding Mg and saw improvements, with still the ocasional stunting. I got some aromatica recently and am having a heck of a time with it - growing real slowly, older leaves getting pinholes and stems rotting. So I am in the process of gradually increasing the Mg to see if it helps. Do you know at what point (Ca/Mg ratio) is it you see inhibition?
Your Ca and Mg numbers are stilll in CaCO3 equivalent numbers, the real ppm for Ca and Mg are:dennis said:Well I was finally to check my waer chemistry today. TDS from Hanna meter and Ca levels from Salifert test
Tank: Tap:
TDS 264 ppm TDS 96ppm
GH 12*= 213.6ppm GH 8*=142.4
Ca 150ppm Ca 120ppm
Mg 63ppm Mg 22ppm
That means that my tapwater has pretty good parameters but my tank water is out of wack due to, I assume, my heavy dosing of CSM and the use of and Onyx/Eco mixed substrate.
Also, can the tap measurments be correct? Is it possible to have a Gh higher than your TDS?
I'll give this a whirl.Edward said:Hi All
The Rotala wallichii been growing well at 20 ppm Ca and 2 ppm Mg. However, it stops growing when Mg changes to 10 ppm. When conditions change back to 2 ppm Mg the plant starts growing again.
This test I have repeated several times. Please take in consideration that the Mg is from MgSO4, not MgCO3. The Ca is from CaSO4 and CaCl2, not CaCO3 nor CaNO3.
Thank you
Edward
This may be true but it could be a dangerous way of thinking. This statment considers natural water sources. Our tanks have the potential to be anything but natural. In my case, I was doseing for several months a trace that contains higher Mg but no Ca. I was dosing no other source of Ca, except via water changes.plantbrain said:In general, if there is a GH issue, lower Mg is typically the reason if the GH is already high, it's virtually unheard of to find high Mg and low or limiting Ca levels if the Gh is 3-5 degrees or high.
Many folks have high GH's and does well with Rotalas and Ludwigia cuba.[/quote
I have not really had issues with rotalas but my L. Cuba was stunting heavily mid-late summer. After my water supply went back to normal and I started adding 1/8tsp Seachem Equilibrium at wc, it has been growing gang busters. Probably for the last month or so.
I thought you always say ratio does not really matter as long as the Gh is over 3-4 Just yankin your chain!It might be evidence of a ratio being important even at low concentrations.