I've had Baba-Yaga for just over a year and a half, with little problem.
I was worried that I hadn't provided a 'proper' burrow, since her tank is a jumble of live rock, some the doughnut-holed aquacultured stuff, some other, with several caves and overhangs. Perhaps this seems more matural to her, as she has one space near the bottom that she often sits in, and another underneath a rock where she spends a lor of time. I want to mobe her into a bigger tank, and she is the only one that I am nervous about moving, since she violently attacks whatever enters her tank, my only one that does this. The magno-cleaner has had a rough time of it, as she takes particular affront to it daring to operate in her domain.
She does seem to patrol a lot, btw.
Baba Yaga is probably just around 4 inches long, and she seems to have stayed this size for a bit now, probably her limit, or close to it.
-Ron