Water change frequency? Needing to drop Alk.

[stxgb15]

Have a reefer xxl 750. 200 total volume Has been an established tank for a year before i bought my current home and have been running for 7 months.
Mixed reef 60/40 acro dominate

0.07 to .18 phosphates at all times
6 to 15 ppm nitrates
1350 mag
480 calcium
14.2 Alk
Reef crystals

I have always struggled with high Alk but all my corals still thrive at these levels. Making a salt change to red sea blue box and i did my first 20 gallon water change and have seen the alk drop to 13.3. My goal is to get down to 8 to 9 dkh slowly to allow the corals to acclimate to the change. My question is how so how soon can i do another 20 gallon water change all while trying not to strip my nutrients?

 

[hexcolor reef]

Don’t use tap water, stop dosing kalkwasser, slowly dose more calcium. Keep water temps cooler to prevent precipitation. Or just do a 50% water change with salt that analysis is 8dkh

 

[stxgb15]

I did have an electrical outage that ended up knocking out two of my radions. Got them in three days later so an acro or two didn't make it

 

[stxgb15]

Don’t use tap water, stop dosing kalkwasser, slowly dose more calcium. Keep water temps cooler to prevent precipitation. Or just do a 50% water change with salt that analysis is 8dkh

I make my own water and get 0 tds. I dont dose kalk and temp is 78 most often.

 

[hexcolor reef]

Are you using PH boosters/balancers
Reef crystals is instant ocean? That stuff is out of wack. I stopped using it the first time I tried it

 

[stxgb15]

Only thing i dose is nopox, phos-E, aquavitro fuel and acropower.

 

[hexcolor reef]

It’s just the salt you use, it’s not a good product IMO just saying since I had the same issues

 

[Randy Holmes-Farley Verified Community Expert]

What is the alk in your new salt water?

My suggestion is to lower the alk in your new water before doing water changes.

 

[stxgb15]

What is the alk in your new salt water?

My suggestion is to lower the alk in your new water before doing water changes.

I am getting 11.6 dkh with my new salt water at 1.026.
I am getting a ph of 7.8 but with a 13.3 alk in the DT. Confused how the ph can be on the low end when the alk is so high

 

[Randy Holmes-Farley Verified Community Expert]

I am getting 11.6 dkh with my new salt water at 1.026.
I am getting a ph of 7.8 but with a 13.3 alk in the DT. Confused how the ph can be on the low end when the alk is so high

High indoor CO2 will do it.