Quote:
Originally Posted by Keri
I'd rehome the sandsifter tho, noyt a good candidate for a smaller system, they eat all the good things out of your sandbed unless you have a Very large system and then they die 
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I agree. The sand sifting starfish is a poor choice for a small tank, and even poorer choice for a newly setup tank.
I also agree that what you are seeing are different pods. Beneficial live foods for your critters. The shell I bet was either mixed up in your sand, or was on your live rock and fell off. Is there anything living in the shell?