Question about cementing dry rock

[Chris86]

Hello everyone,

I was wondering if you guys cement your rocks together inside or outside of the tank. And if you do cement it on the inside, what should you do if you drop some cement on the bottom of the tank. Also if you have any pro tips about using cement to form pillars or any other cool structures with dry rock, that would be great too!

 

[saltyfilmfolks]

both sometimes. with dry rock its easiest to do outside the tank. without getting too chemically complicated(im a dummy) is best to use specific types of cement. for safety's sake Ill send you here.
http://www.marcorocks.com/

 

[Paul B]

Much of my rock I built using PVC pipe as a skeleton. My entire reef structure is held up using these DIY rocks.

 

[Paul B]

Its all holding this up, but you wouldn't be able to pick any of it out.

 

[saltyfilmfolks]

Its all holding this up, but you wouldn't be able to pick any of it out.

its that a white portland? I think thats what they call it.

 

[Paul B]

No, it's mortar

 

[JoeReef]

I used the stuff from Marco rocks

 

[jsker]

I used a product called stone fix. works well.

 

[Chris86]

so I'm starting to make some columns, but the rocks don't anchor on glass. How do you guys prevent the columns from sliding?