How do you figure alk consumption should be greater in the new tank than in the 250 because there is more water? As long as you don’t add more coral or rock, the same amount of coral should uptake similar alk if placed under similar lighting and flow conditions. The only thing that might increase it slightly is the extra surface area that will allow for more coralline to grow.
Adding more coral or changing lighting would be a different story.
Yeh maybe you right. I was thinking of couple factors, no more sand, which might mean less ca buffer.
with larger volume, dilution is more and coral access to the supplement is slightly less accessible...I thought that's why supplements specify dosing amount per volume unit, more volume, more dose...no?
And as you also rightfully said more surface area might mean more caroline algae and which sucks in alk further..
But you have a good point...time will tell.