PH changes ocean vs. aquarium

[Randy Holmes-Farley Verified Community Expert]

@Randy Holmes-Farley

That number was in some articles by Caribsea many moons ago. Having used a 6” dsb for 25 years with a Jaubert Plenum, I can document loss of substrate into bulk water.
Considering that pH in depths of dsb is different than in bulk water, I say aragonite sandbed can buffer a reef tank. Perhaps not SPS dominate.

I think they are wrong.

Sand beds can dissolve even if the water above is high in pH because the degrading organics in the sand will lower pH

 

[Gregg @ ADP]

I read 8.05 in CaribSea article many moons ago. After 25 years with 6” Jaubert Plenum using aragonite, I can document losing aroggonire substrate to bulk water.

Considering chemistry in depths of sand bed to be different than in bulk water, I say that aroggonite .dissolved alkalinity & trace minerals into my bulk water.

I would think the pH under a 6” bed is quite a bit lower than 8

 

[Randy Holmes-Farley Verified Community Expert]

I would think the pH under a 6” bed is quite a bit lower than 8

I measured it in my tank and it was, although I don’t remember the exact value.