Who has had success with pulling GFO/Carbon offline to resolve STN?


New member
Just as it says...who has also pulled gfo/stn and SUCCESSFULLY stopped STN by doing so?
Did u restart with no problems?
Was it a new tank (<1 year).
Other variables u may have noticed?
Did u go back online with it since?
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New member
Update: I resolved issue by doing two things at once...
1) pulled GFO and Carbon offline.
2) did 100% water change over 1-2 week period.

So, I do not know what the fix was for sure. But it worked and has been fixed now since mid March. All growth is great.

Other details, I used dry macro rock and seeded with minimal live sand/rock. Maybe it takes longer for the tank to mature or build up nutrient base. Just some thoughts.


New member
any sudden change can trigger an stn event. it seems alk swings are a major factor along with rapid changes in phos. most likely it is not the carbon causing the issue , most likey the gfo.

i recently started vinegar dosing. i think i started with too high of a dose. noticed stn on my purple nana. had to cut way back on the dose. i may even stop.

the key is to make small changes with any type of chemical media.