Has anyone kept/keep a haddoni in just a deep sand bed without any rock ? Both of my haddoni are currently sat in the sand bed which is approx. 3" deep, maybe slightly more. They both have their foot under an adjacent rock. I'm currently slowly moving my corals and rockwork out of the tank to create a more lagoonal type setting. Having seen many scenes such as the 'Holy grail' thread on here and also pictures from Chek jawa indonesia etc it seems that many haddon iin the wild simply don't have an adjacent rock to stick their foot under. Is this because they feel comfortable with their foot attached to a sub sand rock and sufficient depth of sand to envelop their column ? What sort of sand depth do you feel would be appropriate ? I'm trying to do this once and get it right the first time so any experiences or suggestions will be welcome. Tank dimensions are 52" x 32" and water depth just for clarification is 24" I'm aiming for an additional two haddoni in this tank for a total of four.