Stream rock dimensions

[ltelus]

Hi i am currently rockscaping a 150 and plan on using 2 tunze 6000 in the deco rocks.Can someone give me a rough idea on the size of the deco rocks and can they sit on the sand bed?
thanks.

 

[rvitko]

Roughly 10 * 8* 6 and they cannot sit directly on the sand bed. They need to be elevated or else the pump sucks in sand.

 

[ltelus]

great ,thanks Roger sounds like they will work for me,Liam.