But this is not the general experience, nor do most stars show any signs of any problems before dying. So it may have been fine, or it may have been starving.
Usually I recommend that you need a year to 18 months to know if the star is going to be OK, but even then...it is ok in YOUR system and whatever may be unique to it.
In general, I would propose that people not rely on this. Because what we know is that success with these types of stars is pretty heavily correlated with the amount of surface area of LR available for it...and their just isn't much in small tanks.
Sometimes these stars will take to spot feeding, but don't count on it.
Once an established tank, with say 70lbs of rock, a Linckia multiflora I think would be suitable (depending on tank parameters).