Dirty sand bed. How can I clean it up?

[StirCrazy]

for a guid line you want at least 1 square foot of open sand bed for a fighting conch.. I have 2 of them and they clean up my 92 gal in less than a week. one thing you might find is once and a while they will dissapear for a week to 2 weeks and when they come out they will be bigger than befor (at least thats what mine do) the problem is when they do disapear you get a dirty sand bed again :D but they clean it fast when they come back out.

Steve