You all can laugh at me if you like, but I'm gonna say my Oregon tort is bulletproof.
Dropped through euphyllia and sat in sinularia when I first got it. Half the frag survived. Since then, alk swings, high nutrients, vodka overdose, you name it, I've done it. Never dies, never changes color, never fades, never STN's or RTN's. Even AEFW wouldn't touch it, when they devoured most others.
It grows slow, is my only complaint.