Alk question

[Aaron Stillwell]

Hello. My alk seems to be running high at 10.4. Attached is my levels over the months. Using instant ocean salt. Should I have any concerns?

 

 

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[WheresTheReef]

I had a similar thing happen to me with IO. My euphyllia/fimbriaphyllia were stressed and I lost a few of them over time as the ALK approached 11dkh. I ended up dropping the salinity of water changes to 1.024 which lower the ALK slowly to around 9.5. Of course the tank’s salinity also dropped to 1.024, which is fine. The corals seemed happier. As I filled the tank with more corals I raised the water salinity to 1.025 with water changes which keeps the ALK around 9.5ish. What salinity do you mix your water to?

[Aaron Stillwell]

Typically 1.025


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[WheresTheReef]

Is your refractometer calibrated?

 

What corals do you have in the tank? Are they showing any signs of stress? If not, I wouldn't worry too much. If you do want to lower it a little, then you can just do what I mentioned above.

[nburg]

I run IO, but I have lots of Stoney corals so it never affects my overall Alk stability. If you don’t have a lot of calcium demand, I could see it staying that high. back in the old days, it was common to see people running alk in the 10-12 range but if I recall, you have to increase the energy of the tank as well (higher light and nutrients) which also made it harder to make it stable. 
 

i would say if your corals are doing fine, not a huge concern. 10 isn’t that high.