Mine was mostly on my one rock structure that started as dry rock. (Never any on my other rock structure that was already live rock).What did you do to get rid of yours?
I just did lots of manual removal including pulling out rocks to scrub in separate container of salt water every week or a couple times per week. (Also paper towels to swipe off what I could from the glass and cords).
Took me maybe 1-2 months but all clear for a few months now.
*also started dosing Trisodium Phosphate to maintain detectable levels