Whats the best invert to keep my sand white?

[TonyOrlando]

Whats the best invert to keep my white sand white. I do have an average size cleaning crew but the only 2 things that seem to clean the sand are my diamond goby and sea cucumber. Would adding a sand sifting star or a fighting conch help? What would you all suggest?

 

[graveyardworm]

A fighting conch would be a good addition. I would stay away from the sand sifting star. The sand bed in 72 bow would not be large enough to support one, and it would eventually starve.

 

[BigRiver]

I have a conch (not a fighting) and it works perfectly!
I even had to put some nori in the tank because he cleans the sand too fast for more food to develop!
There are cool to look at too. Mine even has cool colors on its shell.