Coral placement?

[bob`_your_dog]

Hey, i been doing some aquascaping today and i'm just wondering. My pineapple brain, can i put it on my crushed coral or does it need to be on rock. And also my leather can they got directly onto the sand or what?

 

[Opcn]

Brains useually sit on sand don't they

 

[Navarre]

Mine are on the sand, they seem to prefer it there.