Aquascaping with rubble

[Wolf89]

I've got a few good sized pieces, which look good, but I know they would look much better builder high up and having bridges and stuff with rubble. I have plenty. I am worried about it falling down and crushing things. How do I secure it onto the main rock? Thanks

 

[laverda]

Marco rocks and others sell a morter mix specifically for the purpose. You can also use marine epoxy available from the online aquarium suppliers as well as home depot and lowes.

 

[Westernks reefer]

Marine epoxy is really good and really inexpensive