Is anyone else using this stuff? My farm is just loaded with the stuff. From little 3" pieces to large boulders. I have a few pieces in one of my aquariums and it looks really nice. I did test the pieces by leaving them in a bucket for a few weeks and testing the water every few days and noticed no change in the water chemistry. The calcite varies in color from dark yellow to almost milk white while the quartz is really clear. My neighbor calls the stuff honey calcite.