My thing with cyano is bacteria source. A long time ago when we dont have dry rock and only start the tank with live rock from the ocean we dont have much problem with cyano but more with hair algae or diatoms. The live rock from the ocean have multiple strain of bacteria and they must have compete and control the cyano bacteria from blooming.
Forward to now everyone start out with dry rock and go through the normal cycle which only produce nitrobacteria to convert amonia, nitrie and nitrate. Now if you dont introduce any other type of bacteria sources your tank is limited. Years ago we bought colonies of sps and indirectly introduce more bacteria to the tank. Now we buying frags which is tiny and sterilized.
The equipment now is so far advance and they did too good of a job cleaning your tank therefore the nutrients is really low compare to years ago.
Nutrients aka nitrate and phosphate now you have to treat them like Alkalinity which means we have to test and dose it if needed to keep a balanced biological environment.
Zeovit is a good bacteria source system but u just need to control the nutrients dont let it go too low. Please remember zeovit was successful back then because they started the tank with 100% live rock and live sand.