Nutrient export is the #1 way to end it. Too many nutrients is why its there to begin with. Do larger, more frequent water changes and suck as much crud and cyano
out as you can, clean EVERYTHING, skimmer, powerheads, filters, heater ect. Anything that's not spotless, clean it. The addition of a reactor with GFO
or Phosguard will help tremendously as well, I can give you more info on how to go about that if you wish to do so. Flow comes into the mix as well, cyano
tends to like lower flow areas.
Keep at it with what I said above and the problem will go away, it takes time to over come cyano
, the key is patience and persistence. Blackouts, chemiclean, stuff like that is a temporary fix, it doesn't get the source, not to mention countless tank wipe out stories from using chemiclean.. cyano
will not stop coming back until all the nutrients its thriving on are gone, simple as that.