Best fish/starfish/crab/snail

[Ali350z]

Large water change would help...and my trochus snails ate all my diatoms!

 

[JP79]

I love all my hermit grabs. Blue legged, scarlets and red Mexican. Fish? Pink spotted watchman goby. It's hardy and cleans the crap out my sand bed. Yea makes a little mess. But not as bad as my once yellow head goby.

 

[Leslie Tabor]

I will add that a pistol shrimp should be considered a member of clean up crew for those tanks with a sand bed.
The pistol shrimp is constantly working on their burrow and in doing so, they're moving sand from underneath the rock work out into the open.
It's still very important for us to keep the sand bed clean, but we cannot get to those locations covered by the rock.

I love this answer! My choice is my Engineer goby! He has literally cleaned out underneath all my rock structures! He is amazing for cleaning sand! After him I love my nassarius snails. Ooh and my hermits! Can't forget those guys!