Simply they rarely take to spot feeding and need large amounts of LR. If you do not have this, I am afraid there is no challenge in keeping them. Most will starve in smaller tanks or those without enough LR, if they survive acclimation. It takes a good year for them to starve, so success should not be measured before about a year and a half.
I wrote a thread on these stars and others. It is posted in the Archives section.