Ph and alk help

[Kershaw]

Ok so my tank is about 10 months old 125 gal
Kh7
Ph7.75 as of this morning
Cal is 430
Mag 1300

I have some montis , bridsnest a few acro and a hammer. All are fairly small I have had dramatically more coral in other tanks have not needed to dose. How ever this tanks ph has started around 8.1 from cycle and has continued to drop over the past 10 months. My skimmer had a air line going under house sitting near a under house vent. Dose not seem to help. I am going to start dripping kalk since my kh is at 7. But if there are any other options I would like to hear it. I just don't under stand with the amount of coral vs water why my kh and ph keep dropping. I do water changes 30gal every 2 weeks. I normally use reef crystals and justyesterday I just switched to salinity to see if it will help. Doing so with water changes

 

[Kershaw]

Could coraline algae really consume allot of the alk? I have a ton of it growing everywhere and all the coral looks good great color. My urchin can't even keep up with the coraline growth

 

[Tommy's Reef]

Shoot ya man. I dose alk buffer every 2 days 3 teaspoons

 

[Tommy's Reef]

6 teaspoons of calcium every day

 

[Kershaw]

Even with a theoretical low demand ?

 

[Randy Holmes-Farley Verified Community Expert]

Coraline algae alone can consume 2 dKH of alkalinity per day.

 

[Tommy's Reef]

Dude coraline is beast I think it sucks up more than my corals do

 

[Kershaw]

Dear god! This is my first tank that even would grow it. That would explain it

 

[Tommy's Reef]

Start dosing its easy

 

[Kershaw]

Yea I have kalk. I have some settling now. I'll start putting in ato

 

[Tommy's Reef]

Never used kalk before I don't no nothing on it but kents marine buffer keeps me perfect