Hey John-
You're right-they only eat aptasia. As those of us who suffer from Aptasia know, you're never REALLY free of them...they just make you THINK they are all gone-but they are still there-hiding-lurking-waiting for your guard to drop-and then you wake up one morning and BAM....suddenly you can't see your corals through the forest of their scrawny little bodies.
Yeah, well I have that all planned out. I have 4 tanks, so I will move them from one tank to the next and by the time they have cleaned all 4 tanks, it should be about time for another outbreak...so I'll just start the process all over again.
(And don't even get me started on the sumps!!!
)