Originally Posted by JakeVS
Im wondering if anyone could give me suggestions for a good epoxy to build rock structures for my FW
aquarium? would silicone work or even be strong enough to hold it? i want to build an arch, wouldnt be much rock. maybe 5lb.
Are you thinking epoxy to glue rocks together? I'd be leery of anything that can leech into the water column. Aqua safe silicone would work and if the rocks have a rough surface, a fair amount on each joint should hold pretty good IME.
Here's a background thread, but IMO
many of the materials could be used for your rock structures.