Where I can buy aquarium flat slate rock?

If you buy any board of Home Depot or Lowes, and answering suggests, you need to test if it is aquarium safe the best way to do this is with a water solution of white vinegar, just put some in it, if you see bubbles of foam, Hope is not a security deposit that helps good luck EB

Universal Rocks & DAP decorate 10FT TANK with Flat Rocksheet.wmv