There are other things that will help. A couple suggestions:
Nassarius Snails
Serpent Stars
Fighting/Queen Conchs
Cerith Snails
Hermits (Sorry wit
)
General opinion is the sand-sifting star does a nice job of keeping the sand purty but wipes out your sand bed critters at the same time, in which case your sand bed doesn't function properly as a method of filtration.
Of course, you will hear mixed opinions on that but I would say the majority believe sand-sifting stars are not a good idea for a live sand bed.
T