Starting this thread to share some of my personal experience battling this nuisance algae which has been troubling my tank for almost 6 month..
my existing tank is more than 5 year now and It seem at some point it is true that for a very mature tank , all sort of problem might come especially algae..
in fact i have tried almost all the products out there , and sadly to say none really work. Some product manage to control it, but after awhile of cleaning and detoxify it with Hydrogne perxiode it seem to keep coming back again .
i was actually very worried about using medicine esp antibotic threatment on my tank how it will affect my beloved fish and corals. However, after doing my own research online, all the positive out come encourage me to try so..
This is a very detail explanation of the Fluconazole treatment from other forum here ( https://www.reef2reef.com/threads/bryopsis-cure-my-battle-with-bryopsis-using-fluconazole.285096/) which inspire me to try the treatment.
This is some photo of how bad the outbreak is before the treatment.