I have yet to have any survive Brook so I wouldn't know. I had one for nearly 5 months before it just came down with it out of nowhere and died even in hyposaline
QT. The last time I bought clowns they showed Brook the day after I bought them and died 3 days after from Brook. Also in hyposaline QT w/
salinity at 1.018. There is someone that has managed to keep a pair for over 20 years though, so if you get lucky and they don't have brook then you could have a very hardy fish for a very long time.