I am thinking of adding a few to cuc. 90 gallon standard, have plenty crabs and snails. Thinking of adding a brittle or serpant star, also thinking of linkia star. wanting little more for cleaning sand. Have heard conch do good job of this, I have a yellow watchman now but he is small and doesn't really clean a lot. Any suggestions or thoughts will be appreciated. Tank is pretty heavy stocked but I am running a very large skimmer nitrates around 10, phosphate at .03, alk 9, calcium 450, am running gfo at this time due to feeding heavy for the anthias trio. My goal is to lessen or even remove the gfo if possible and be natural and simple. Just getting the display fuge started with macro at this time so im sure this will help as well once it is growing out well. Will post pics when get time. This is a mixed reef with 40 gallon display fuge and 30 gallon sump, I am having a little gha.