I've got quite a bit too. Pretty sure I've lost some zoa's to it taking over a rock. My bleeny won't touch it, emerald crabs don't touch it, Kole tang won't touch it. I have gotten rid of it on individual rocks by sticking it on the darkest spots of my sump. I believe the Naso is the only way to get rid of it without killing all your rock. But as was mentioned, tank size is an issue. Best of luck, I feel your pain. Fyi, I'm taking the bigger tank route and getting a Naso
