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Dosing phosphate causing leaching live rock?

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rynosreef

rynosreef

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I was looking over my numbers and noticed something worth mentioning. I usually have a daily pH swing of 8.05 to 8.28 or so. This is with the skimmer pulling air through a CO2 scrubber. The day after I mounted these frags we went on a 3 day trip. When we came home, the pH read 8.68/Alk 7.6. Alk is usually 8. It's hard to believe the pH could be that high, but in a house with no one adding CO2 and a scrubber... maybe?

Does it seems likely that the combination of
A) frags being stressed from handling, mounting and
B) this pH spike, could be the cause of the onset of STN?
 

Randy Holmes-Farley

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I was looking over my numbers and noticed something worth mentioning. I usually have a daily pH swing of 8.05 to 8.28 or so. This is with the skimmer pulling air through a CO2 scrubber. The day after I mounted these frags we went on a 3 day trip. When we came home, the pH read 8.68/Alk 7.6. Alk is usually 8. It's hard to believe the pH could be that high, but in a house with no one adding CO2 and a scrubber... maybe?

Does it seems likely that the combination of
A) frags being stressed from handling, mounting and
B) this pH spike, could be the cause of the onset of STN?
If it really got that high, it implies you have inadequate aeration. Complete aeration with normal CO2 air would need an alk way over 15 dKH. I'm suspicious that it could get that high without initiating some precipitation of calcium carbonate.

Regardless, I'm not sure if that pH is stressful for corals or not.
 

Pedoconfuego

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I have had ph fluctuations from adding a co2 scrubber burn acropora. And it only jumped up maybe .3 or so. So I can imagine the jump from you leaving the house could have caused issues if test results are right.
 
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