[impur]

IME Cyano is usually cured by a high flow tank.
I have 2 tanks both sharing water, skimmer, sump e.t.c.
The main display has never had cyano or bryopsis or anything.
The little tank with less flow has both. 2 tanks one system so I blame it on lack of flow and lack of tangs and other snails, herbivores e.t.c.
C

I have over 4000gph in my 75gal tank giving me over 55X turnover.

Maybe it is dinoflaggellates.

Actually i had both. The dinos went away and have stayed away since turning the lights off for 3 days straight.

You're likely not helped by the fact that if you've had cyano for 6 months any beneficial,desirable bacteria have been outcompeted and starved to death ........

You need to fix the cyano and reseed your bacteria as well.

Funny thing is, a lot of the advice here is "let it run its course", which obviously is not the best advice. So would reseeding the bacteria help fix the cyano, or do i need to get rid of the cyano THEN reseed? And are you talking about the prodibio bacteria?