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Yes , if you are growing macro algae or even GHA then your PH will raise due to photosynthesis. High PH is desirable , although 8.4 is about as high as I want .
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I wouldn’t worry about your ph getting too high from the fuge. It would get to a point that it can’t go any higher because it’s depleting as much of the co2 as it can.My post-cycle is right were I want it. I'm not worried about that or the diatoms. I am worried about my pH continually going up. I haven't attempted to see if it would continue up above 8.45, but it does go up from 8.2 to 8.45 in less than 24 hours. That is what I need to solve. I assume it is the refugium lighting schedule? I've never had a refugium before.
What about reducing the light time? Interestingly, my fuge light is still on acclimation mode so it's not even at it's highest yet. Or running the light on a concurrent schedule with my display light?I wouldn’t worry about your ph getting too high from the fuge. It would get to a point that it can’t go any higher because it’s depleting as much of the co2 as it can.
The ph is a secondary benefit to the fuge. It’s main purpose should be nutrient export. You can adjust the nutrient export by harvesting more/less of your macro algae or increasing/decreasing the lighting schedule.What about reducing the light time? Interestingly, my fuge light is still on acclimation mode so it's not even at it's highest yet. Or running the light on a concurrent schedule with my display light?
I wouldn’t worry about your ph getting too high from the fuge. It would get to a point that it can’t go any higher because it’s depleting as much of the co2 as it can.
I think that is true in many cases.Low pH can inhibit calcification in some corals, yet leave other species unaffected.
This is why I run kalkwasser in addition to my calcium reactor, as my understanding is higher pH (to a point) faster growth rate?