Safe epoxy or glue?

[Myka]

So...no one actually ansered the original question. Is there a "generic" 2-part epoxy that is reef safe? I'm building my rock scape soon here, and have already bought some acrylic rod, but I will end up using quite a bit of epoxy as well to help secure the rocks. I haven't tried zip ties before, but I wouldn't mind using zip ties too, but I'm not sure how you guys hide them? At least the acrylic rods are cheap!