shaywood Posted April 21, 2018 Share Posted April 21, 2018 (edited) Just replaced my GFO and noticed my pH drope from 8.07 to 8.0. Is this normal? Edited April 21, 2018 by shaywood Quote Link to comment Share on other sites More sharing options...
Exodus Posted April 21, 2018 Share Posted April 21, 2018 It can in fact be common if you used to much GFO and stripped a ton of P04 from the water column to quickly. See this post here, they describe it in detail. Quote Link to comment Share on other sites More sharing options...
shaywood Posted April 21, 2018 Author Share Posted April 21, 2018 Thx Quote Link to comment Share on other sites More sharing options...
xmas_one Posted April 21, 2018 Share Posted April 21, 2018 I’ve noticed the same thing. If I remember right, the iron acts as a nucleation point for calcium carbonate precipitation. You would also see a drop in Ca and Alk. I also had carbonate build up on everything in my sump when I was running GFO, also my substrate was clumping. This is why I don’t like running GFO, it’s real easy to run too much and get your parameters swinging. Best to address why you have a nutrient problem rather than using a bandaid (GFO). 1 Quote Link to comment Share on other sites More sharing options...
albertareef Posted April 21, 2018 Share Posted April 21, 2018 3 hours ago, xmas_one said: I’ve noticed the same thing. If I remember right, the iron acts as a nucleation point for calcium carbonate precipitation. You would also see a drop in Ca and Alk. I also had carbonate build up on everything in my sump when I was running GFO, also my substrate was clumping. This is why I don’t like running GFO, it’s real easy to run too much and get your parameters swinging. Best to address why you have a nutrient problem rather than using a bandaid (GFO). Good info - I have heard people mentioning having issues when running GFO but hadn’t seen it laid out in this way. Quote Link to comment Share on other sites More sharing options...
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