New tank high alkalinity

I'm not sure why.


PH 8.0
grav 1.0235
Amonia 0
Nitrates 0.2
Nitrites undetectable.
KH 14.4


Stocking;


6 chromis
3 urchins
nassarius snails
7 hermiths


bubble coral
zoos
GSP patches
some macro algaes ( cheato- caulerpa, red algae) In starfire display refugium
Recent algae diatom bloom, because i fed the zoos which i'm told i should of done.


2 Dc pumps 950gph running to both the display refugiums and starfire tank
Reef Octopus 3000 working not really skimming anything.
Running GFO and carbon reactors
Lights 12 h cycles with including 3 h of actinics
Powerheads 5 controlable Tunze 6095 and 6055 in both tanks.


Display refugium feeding Reef by gravity.


Both tanks 2 " sand bed. Last water change 2 days ago.


How do i deal with this high alkalinity? Thanks for your time.​

 

You didn't mention type or amount of rock.I'm really just guessing but it may be possible that the rock is adding or supplying alk.I recently added a large piece of dry rock to my tank(40gal.) and noticed an increase in alk.I had not done water changes or dosed anything that would cause alk to rise.

 

When I set up my tank my Alk would be near 18 at times!!! I thought I was going to have issues but over a f ew months it regulated itself down and now I dose Alk!

Also what salt do you use? I use corallife and it seems to run high in many of the minerals. My CA mixes up around 500 and Mag around 1400-1500 with the Alk at like 8. I have heard of people using corallife and IO in 50/50 as a DIY saltmix to make a cheap reef crystals.

 

just hypothesis Mud but based on the above, it sounds like it may be your sculptures and you just need to give it time.

 

You guys are probably right. I did start my tank with an artificial product and usually the 6 to 8 weeks of cycle takes care of this but now the tank is only 15 days old and the KH hasn't stablelised yet. The rocks could stil be leaching for a while untils a few more water change.

 

Whats the calcium and Magnesium??

 

new readings

Ok well this tank sure has its mood swings; my fresh sw has a 12.1 KH , and this afternoon i took another reading because my stool was out and fully extended, reading 11.5 KH so the tank is making adjustment by itself, and the fact that my skimmers is taking out stuff might have something to do with it, someone mentioned the breakdown of of nutrients who knows, i might of caught a spike in the process. very interesting anyway thank you all..