Alkalinity?

[Cokato mn]

my tank has been up 6 months. 80 gal hex 2 55’s in basement stacked for sump 20gal quarantine tank in line with sponge filter can be isolated when in use otherwise I clean and keep it inline running for a total of somewhere around 165 gal. Mag is high at 1440. Calcium 415. Ph 8.1. Temp 77.9 salinity 1.025. Dkh 7.5. And I can’t seem to raise it, precipitates out and finds its way to the sump. I have lots of bio media an 8 inch reef octopus skimmer Fed from outside air. A 50 watt uv sterilizer. GFO and carbon.

How do I raise the dkh trying soda ash dry.
Have sodium bicarbonate and kalkwasser.
Do I need to use one or more together?
Being low and jumping and dropping can’t be good need some assistance
Thanks

 

[SteveEreef]

Do you have a lot of SPS? How much alk do the corals consume in a day?

 

[Cokato mn]

No I don’t I have a bubble tip anemone and a long tentacle anemone a dozen snails otherwise lightly stocked small fish couple shrimp

 

[Cokato mn]

That long tentacle is not liking it

 

[SteveEreef]

I would use sodium bicarbonate to raise the alk. That way your PH won’t rise to much. BRS has a calculate to determine how much you need to dose. I would think that water changes should keep your Alk stable given your stocking level

 

[Cokato mn]

Thanks Steve
I’ll try that been having hard time Why is it falling out doesn’t seem to be taking to much calcium out maybe I’m adding to fast, to much I use there calculator for amounts read about not raising levels more than? per day but it has been precipitating out in fine white particles makes a heck of a mess