fired clay should be fine as long its not painted. There is a guy/sponsor on Reef2Reef (gooch)that sells rock like clay structrures and frag racks that are made of clay. I think his business is called Alternative Reef? Try googling that.
I have seen one tank with driftwood. The guy clear expoxyed the entire piece before putting it in the tank. I dont know if it was necessary but it seals the woods from leaching out anything or possibly degrading.
glass/acrylic/pvc/neoprene/rubber/vinyl are also safe.
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