"Cementing" rocks together?

[sloshes]

I have a zoo colony on a oyster shell that has been very happy sitting on the edge of a large piece of live rock. It's also perfect for display. Lately one crab or another has been knocking it off it's block. Any suggestions on how to adhere it in place? No rubber bands please. Thanks in advance.

 

[JohnHenry]

Superglue works well. Try the gel kind.

 

[KaBoOm]

If I'm attaching rock to rock and I don't care as much about how long the curing time is. (i.e.: it will stay in place and I'm attaching for safety) I use this:

http://www.bigalsonline.com/catalog/product.xml?product_id=19243;category_id=2347

Works really well and after a while coraline algea will start to grow over it.

If it's a frag that isn't attached to a rock, then I use superglue gel.

 

[sloshes]

So I can apply the super glue to the oyster shell then place it on the rock in the water? Thanks in advan.ce

 

[sloshes]

The epoxy looks good, thanks again.

 

[olipug]

Deltec also produce a product called AquaScape putty. I used this to cement my LR together to make a more open structure and use it to fix new corals that are attached to rock, to the rest of my LR. It sets rock solid and dries to the colour of coraline algae. Works well.