Care of a starfish depends greatly on the type of star you decide to purchase.
Sand sifting stars need a DSB
, and will quickly eat all the life found in the sandbed.
Brittle & Serpent stars are great scavengers, but most are primarily nocturnal.
Many stars are not reef safe - is your tank a reef or FO
Some stars that *are* reef safe, require a large, established (6 month +) tank, with a lot
(Linckias, Fromias, etc.).
All stars are super-sensitive to changes in salinity, temp, and pH, and need extreme care in acclimation.
No stars are photosynthetic - lighting is not an issue.