If its left in tank then the options are limited to wrasses or peppermints and both are hit or miss
If your home often you can try to suck as many off as possible but there often many more than what you see hiding throughout and underneath , the babies are tiny too a lot smaller than zoa eating nudis.Other montis are at risk and I've heard of them going after chalices.
If it were me I'd try the manual route but you can clearly see the damage they do so you'll know when it's time to pull it out and qt with weekly dips......I've had to do this and keep the display fallow it sucks but they are fast breeding nasty little buggers lol not a lot of damage at first but once Colonie is taken over loses tissue faster and faster.
Such a nice growth pattern to , I hope it does pull through for you
