?'s about Stream Rocks?

[bljohnson]

I have a barebottom tank and was wondering if the rocks will "slide" around from the GPH the Tunze puts out. How heavy are the rocks and do they have rubber feet? Are most people putting them in the front corners pointing up and to the opposite back corner? I don't want to "pile" other rock on these as I want to be able to easily remove the Tunze's for cleaning.

 

[rvitko]

I nested mine on top of other rock and have no problems with them moving.

 

[rvitko]

By the way, they are ceramic so fairly light, about 4 lbs. They do not have rubber feet.