Sand Sifting Creatures?

[nanmer]

I have a sand sifting star and a dragon goby. I have beautiful white sand with plenty of little critters in it. It seems they don't always get to the bottom of the sand and this must seed the upper layers. Since the sand star is growing and doing well after 8 months it seems he is not going to starve to death like some people say they can.

My daughter named our dragon goby "Norbert" from "Harry Potter" LOL