PH low

[reefer1]

I need some advice on getting my PH up, I am running a dual chamber calcium reactor thats been keeping my alk at 10.8DKH and my calcium between 400 and 425 PPM, the problem is my PH at night drops to 8.0 and during the day reaches 8.12-8.14. I sometimes dose with kalk to bring PH up but do not want to overshoot my alk or calcium. Is there a product that will only impact PH but not alk? This seems like a common issue for those running reactors but thought I would ask anyway. I probably should not worry since all inhabitants look good.
Thanks

 

[bang guy]

My suggestion is to drip limewater like you have been but drip it 24/7. To prevent your Ca and ALK from getting too high just lower the bubble count in the reactor so it dissolves less media.

 

[neowind]

Definatly what Bang Guy said. If you need a real quick fix though you can buy PH Buffer 8.3. It will buffer you PH to 8.3.

 

[brooklyn johnny]

Along with my dual chamber reactor I run a Nilsen reactor, which gives you the benefits of kalk (as Bang mentioned), without the hassle of mixing kalk every night. I hooked mine up to my auto topoff and add kalk once a week. With that said, 8.0 is nothing to worry about and I never worry unless mine drops below 7.8 at the low end on my sps system.

 

[golfish]

I also run a dual reactor along with a kalk reactor. Your PH is fine. If I were you I'd bring my kh up to about 15. With a high alk you don't need to worry about the PH.
Low pH is the norm when running Ca reactors, my pH ran below 8 most of the time on my last tank, even with the kalk reactor in never reached 8.2
My new tanks a little different but I expect when it gets full of sps like my last tank it too will run on the low side because I'll be adding more co2..
FWIW, I keep my kh around 16.