I removed the small stones I had in my aquarium, I am pretty sure they were polished (by that I mean, with a sander or something) but on the off chance they were varnished instead. I did soak them all in boiling water over night before using them, and the water didn't smell of anything, but I think it's better to be safe. They don't really add that much to the look anyway, just something interesting to break up the gravel.
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