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im a big believer in patience. you have excessive cyano because your tank does not enough have "good" bacteria/algae in your tank which outcompetes the cyano. just give it some time. might take a couple months or even more. stuff like chemiclean is essentially an antibiotic. it will help, as cyano is basically a bacteria, but it does affect other bacteria in your tank too. but if you want a quick fix yea it should help, just be mentally prepared that it will come and go lo. if you want to go the "natural" route (patience), just elevate your KH slightly (Julian Sprung recommends above 8) to help. increasing flow around cyano growth area helps too.

You can consider NEarth XPestminus too, it’s a reef safe solution for treatment and prevention of diseases.

I don't think many people use this but Nearth regendip M+ has been working very well for me! Its a fish dip that I use to remove any external parasites when I introduce new fish into the tank (without quarantining because I don't have space for a quarantine tank). I've introduced like 5 more tangs and alot of other fish into my tank this way and no fish have died from any parasites so far for about half a year already after ich wiped out my tank. This dip can also be used to treat sick fish but I havent had any sick ones so far so not sure if it works as well as copper or paraguard