take this reply with a grain of sand, um salt....i have only been doing this for about 2 months, and my tank was a gift, and with my impulsivity, I just buy stuff the guy at the store says is ok and give it a try - mostly successful.....HOWEVER, I had a diamond goby, chowed big time for a week, I left town for 2 days, and returned never to see him again.....my friend suggested that if he was sick and went down, the blue legged hermits would devour him in 24 hours....SO, on to my sand sifting star....looked awesome, moving around nice, and 2 days after purchase, I see the crabs had eated an arm off him...have not seen him yet this morning, he may have buried himslef in a self-created grave, been eated, not yet sure....
My tank is a 24 gallon Aqua Pod, and it has been mentioned on this board, and other reading that perhaps the tank is too small to produce enough waste for the star to live on....same problem with the goby? not sure, but I do know I am 0-2 in sand helpers....everything else I bought is doing great except what I expected to be the heartiest 2 purchases....go figure????