I hope its as good as the black. If this one survives I'll add another. or twoUgly but effective! The pure black ones are straight sand sifters (not sure about the mixed colors).
Sand Sifting Sea Cucumber - Oceans Garden Aquaculture
Cucumbers are notorious for cleaning the sand bed of coral reefs and rock reefs eating detritus. They move along aerating the sand and release debris and
www.oceansgarden.com