Also consider the fact that GFO
is suppose to be replaced every 2 weeks like bavass said.
Other than that, I read this whole thread, and there is no reason for you to have cyano
bacteria if you followed everyone's advice.
Recommendation in order to close this thread is to pull out your carbon, turn off skimmer, run your chemiclean, 20% water change in 24h with RODI
, add carbon, replace GFO
in 48h. Skimmer will not be operational for about a week.
Feed less. You are missing one of these steps because these are the only reasons to have cyano