High PH increasing SPS growth

[alex77619]

Under same KH 8, I am experiencing faster growth for raising PH from 8.4 to 8.6
I temporary doing dosing instead of my Ca Reactor due to I ran out of CO2.
Due to SPS needing calcifies to grow bone. Seems like higher PH is giving me better growth.
My other parameter are as follow:
PH8.6
KH8
Ca 450
Mg 1450
NO3 5
PO4 0.06

 

[Big G]

Interesting. Have you heard Dana Riddle's speech at MACNA? All about coral growth factors:

https://www.bulkreefsupply.com/vide...light-water-motion-by-dana-riddle-macna-2016/

 

[alex77619]

6/13

6/20

 

[Randy Holmes-Farley Verified Community Expert]

I do expect higher pH often leads to faster hard coral growth.

 

[7237689918]

I do expect higher pH often leads to faster hard coral growth.

Probably a silly question, but for corals does faster also mean healthier generally?

 

[alex77619]

I do expect higher pH often leads to faster hard coral growth.

Randy, correct me if I’m wrong

Because in our reef tank

Three things balance determines our PH

[H2CO3]、[HCO3-]、[CO3-2]

Where they are buffering the ph

And H2CO3 is acidic while CO3-2 is base.

That is why if u have a pure baking soda HCO3- the ph will tend to be 8.4

PH8.4 is the first balance point of carbonate.

And how coral growth

Ca+2 + 2HCO3- --> CaCO3 + H2O + CO2

When u are at a same KH, higher PH tends to have more HCO3- which also is easer for coral to create their skeletons.

 

[Randy Holmes-Farley Verified Community Expert]

Probably a silly question, but for corals does faster also mean healthier generally?

I do not know the answer to that.

 

[Silver14SS]

I do expect higher pH often leads to faster hard coral growth.

My opinion is completely antecdotal, but with higher pH my alk consumption goes up. I assume it’s due to increased growth.

 

[Randy Holmes-Farley Verified Community Expert]

Randy, correct me if I’m wrong

Because in our reef tank

Three things balance determines our PH

[H2CO3]、[HCO3-]、[CO3-2]

Where they are buffering the ph

And H2CO3 is acidic while CO3-2 is base.

That is why if u have a pure baking soda HCO3- the ph will tend to be 8.4

PH8.4 is the first balance point of carbonate.

And how coral growth

Ca+2 + 2HCO3- --> CaCO3 + H2O + CO2

When u are at a same KH, higher PH tends to have more HCO3- which also is easer for coral to create their skeletons.

I do not know (and do not know if it is known) whether corals take up carbonate directly, or take up bicarbonate and spit back out an H+.

Either of those two things is easier to accomplish as the pH rises in seawater.

They are also easier to accomplish as the alkalinity rises at a fixed pH, and growth likely increases under those conditions too.

 

[alex77619]

I do not know (and do not know if it is known) whether corals take up carbonate directly, or take up bicarbonate and spit back out an H+.

Either of those two things is easier to accomplish as the pH rises in seawater.

They are also easier to accomplish as the alkalinity rises at a fixed pH, and growth likely increases under those conditions too.

following figures show how corals forming skeletons.