Steli89
Aquarium Advice Activist
I found these rocks in the woods behind my house. I was wondering if they'd be safe to add to my tank. They're more of a black color even though the pic makes them look more grey. I noticed on some of the rocks that there might be some rust but I'm not sure if it's rust or just dried on dirt and clay. I've read about some rocks leaching hard metals into the water so I want to be safe before adding them in. Does anyone have any ideas?