Hello
@ScottB
So a few observations that I made that helped me solve it.
1. I removed the fact that is was flow related, even in extremely high flow area’s I was growing cyano. Between MP60’s and 2 gyres I have almost no detritus and when I blow the rocks with a baster very little if nothing comes off
2. I noticed it never really grew in thick patches on the real from the ocean rock, I would get maybe a little patch if that. Only grew thick on fake rock.
3. My nitrates were getting lower and lower but my phosphates were staying the same while running a fuge. Corals started to lighten up so I dosed Nitrates up to 10 and noticed the mats started breaking up a bit, and getting stringy. Didn’t solve it but was an observation.
The conclusion I came to knowing those observations was my N/P ratio being off. Once I balanced it to 10-15 nitrates to .08-.12 phosphates the Cyano continued to break up over a couple months.
Concerning the dead rock having the Cyano I started adding some bacterial diversity by dosing zeobak once a week and Cyano clean once a week a few days a part. Oddly enough I noticed better polyp extension when dosing the bacteria. I keep a notebook with any changes and observations, it always seems to help.
I never really ever had Cyano until I built this bare bottom tank, there is something to be said about biodiversity that comes from sand and real live rock.
The tank has been up for little over a year and it took about 3 full months to get rid of all the Cyano sticking with the schedule.