Unless your sandbed has enough organisms to sustain the appetite of your starfish it is certain to perish eventually. They will go unseen for decent amounts of time in healthy environment aswell so that may also be the case. However they do need a fairly large amount of sand to comb through and most home reef setups are not capable of keeping sandsifters for any lengthy amount of time. I had 1 in my matured 120 for a little over a year before he disappeared for good.
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