Join Date: Feb 2012
Location: South Central, PA
Well actually, I talked to my boss today at work. Why the fact that he is an avid rock collector/amateur geologist slipped my mind, I don't know. The fact that he owned aquariums in the past as well makes me trust his judgement and opinion.
I had this discussion with him today and he told me that, while the rocks themselves are composed of mostly sandstone, and alone they are harmless, the fieldstone harvested from the mountain ridges in this area are found to have very high levels of iron in them, this gives them that nice rusty aged look after installation, but they could slowly leach toxic levels of iron into an aquarium environment, and should essentially never be used in an aquarium setting.
He seems to think that ones found in river beds would be a safer bet if one did want to use some in a tank.
30 Gallon - Congo Inspired Biotope - 6 Congo Tetras, 1 Chubby Pleco