For those that have the stars, how big and old is your system? How long have you had the stars in the tank? I ask this because I thought they have a tendency to quickly eat all the micro fuana in the tank then slowly die due to lack of a food source. If Huly's system is too young or small, a sand star may not be good choice.
Also from LA:
"As such, the Sand Sifting Sea Star should be actively fed a varied diet consisting of natural food sources, especially in well-established marine aquariums. Otherwise, this voracious feeder will quickly clean your aquarium of detritus and then burrow into your substrate, starve, and eventually begin to decay."
I would also consider your ability/desire to feed it to keep it alive long term.