I had an over population problem with them.
Over the course of two and half yrs, 2 went to 13. I had to get the number down so I took out a couple of the rocks and put them in the backyard for a day or two. One rock had 6 on it. Even then, I needed to scrape, scrub the remains off before going back in. Unbelievable smell. Of the 6, only one fell off the rock. The rest all hung on like grim death.
These things dont give up the ghost easily. You can drop one on the floor and leave it there for 30 minutes, put it back in the tank and it shrugs it off like a hangover.
There was no local market for RTBA's, could not give them away. Many folks in this area have had too much success with them.
Before .. and note blue stylo in the middle of the tank. It got burned by a nem and withdrew most polyps, prompting my action :
After about a week, stylo polyps back out:
But I thoroughly enjoy having a couple in my tank. Many folks when they see the tank dont look at sps, they look at the clown and rtba's. This reef is lit by two Kessil a360's only. Cheers.