PH problem on new system stuck at 8.0

[hohmfree]

I can not seem to get the PH above 8.0
I have been running a new system since the beginning of January. It is a 120g with a large wet/dry filter (30x18x14). I am using a Dolphin 2100 for the return and have a dedictaed Blueline 55 for my MR2 skimmer. Lighting is 2 175w halides with 2 96w PC actinics. I recently bought a Marine Pinpoint PH monitor. Both it and PH test kits verify PH level at 8.0.
I have been dosing the system with Seachem reef buffer about every 2-3 days. The level goes to 8.3 then eventually drops back to 8.0.
Can overskimming cause this?
It has been 5 years since I set up a new system and do not recall having this problem in the past.
HELP!!!

 

[rdmpe]

Try posting this question in the chemestry forum. Also should post your Alkalinity.

My PH is usually 7.9 to 8.0 at night and 8.1 to 8.2 during the day FWIW...

 

[hohmfree]

Thanks for the advice. i'll do that.

 

[mg426]

Might be CO2 in your environment/house. is your home tightly insulated?? Try taking a glass of your water outside for a couple hours then test it see if the PH goes up. Also try the chemistry forum as suggested.

 

[L8ndeb]

hohmfree,

I would be looking along the same lines as mg426 mentioned. As tightly as homes are now sealed, Co2 is naturally higher.
I had a simular problem in my tank before I plumbed the intake for my skimmer to outside air. It increased the Ph .2 overall. Good luck.