Very sweet sand sifting star needs a new home

Thanks to Spyder, I googled the star and yes it needs a bigger home than my new 29G biocube. I bought him from a reef specialty store for $19.99. And they won’t take the fish back, bloody hell. Store policy and all. Why did they sell it to me! I was there an hour going on and on about my tank size...

ID please

I was hoping someone could tell what this is growing in my star polyps. Read more:  ID...