How much will my dkh increase with my water change?

[Reefing_addiction]

How much will my dkh increase with my water change?

75gal tank (estimated actual volume of water)

dKH dropped to 7.6
Last time I tested fresh mixed salt water it was at 10 dKH (I’ll check again before I do my water change)

I was going to do a water change today, but I am concerned with hurting my corals.
My alk is normal around 10 and obviously consumption has increased. I also under stand I will need to start dosing.

I haven’t checked my calcium (but I will prior to water change) as I know if dKH is down so is calcium.

What’s the best way to get my alk back up?

My nitrates tested between 3-5 (nyos)
I haven’t checked my magnesium yet
Phosphates were .14

@Randy Holmes-Farley

thank you in advance!

 

[redfishbluefish]

The easiest way to get alk up is to dose baking soda. I'd suggest making a solution and adding that instead of the dry powder. 1 1/8 cups of baking soda to one gallon of RO/DI. Use a reef calculator (LIKE THIS ONE) and pick Randy's Recipe 2 to calculate the amount needed to raise alk.

 

[Reefing_addiction]

The easiest way to get alk up is to dose baking soda. I'd suggest making a solution and adding that instead of the dry powder. 1 1/8 cups of baking soda to one gallon of RO/DI. Use a reef calculator (LIKE THIS ONE) and pick Randy's Recipe 2 to calculate the amount needed to raise alk.

Thank you!

 

[Reefing_addiction]

The easiest way to get alk up is to dose baking soda. I'd suggest making a solution and adding that instead of the dry powder. 1 1/8 cups of baking soda to one gallon of RO/DI. Use a reef calculator (LIKE THIS ONE) and pick Randy's Recipe 2 to calculate the amount needed to raise alk.

I guess dosing to get calcium back up would also be easier?

I haven’t done a water change in a little over two weeks (probably closer to 3) so I am thinking it’s time to do one either way