Hello everyone, So I convinced my wife to let me get another tank. She agreed, as long as she can choose the Tank and type of fish. She wanted something that's not in the way, so we chose a 36Gal Corner Bowfront. She also fell in love with with African Cichlids. So I began my research about them, and about Rockscaping, and found a guy on YouTube that said he uses Rocks from his nearby Pond. Question is, is that safe? I will have a Sand Substrate. I also have a little pond nearby that has these Rocks/Stones, and there are tons of them. Can I use these to Rockscape and create tunnels and caves, granted that I'll thoroughly clean them?