Ph, kh issues

mainereefer

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I started testing because I have corals bleaching looks like I'm having I'm having issues with kh and ph....
No matter what I do I cant get ph above 7.8 and kh wont go above 7

I'm dosing kh twice a day it should bring it up by about .5-1 each time but I'm testing when lights are off out and with lights on and not much change... it's been 4 days with no change

Mixed reef lps, zoa, shrooms....
 

Pistondog

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Do you have a skimmer? If not try an airstone to help gas exchange.
I'm guessing windows are open, so not an ambient co2 problem
 
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mainereefer

mainereefer

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Windows are open 24/7 this time of year.
No sump or skimmer, fluval 304 with scwd return and a wavemaker
Plenty of water surface movement...
Nitrate about 10
Po4 just showing on test so less than .25
Calcium is about 440

I'm at a loss... thinking about doing a few big waterchange's this week
 

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