Mine has been stationary for 3 months. Very very hardy under good condtions.
I have lots of light (2x175mh and 2x65PC), and pretty good water, although nitrates have historically been 10-20ppm.
I got my purple condy for basically free at the LFS
because 2/3'rds of his tentacles were ripped off. It was a "project".
Within a month, the tentacles were all grown back, and since then he's tripled in size.
Lots of my fish will swim through its tentacles (quickly) with no apparent harm. I've touched it many times without feeling any sting.
180G build thread
180G All-glass with dual megaflows in a custom stand
AquaC EV-180 skimmer
250 pounds LR
160 pounds aragonite
Custom acrylic sump from GlassCages.com
2xPCX-40 return pumps
2x250MH 14K, 2x175MH 14K - PFO lighting, 2x65W PC
No-name 36W UV
Water General 125GPH RO/DI