Seahorse Enterprises Feng Shui Decorative Pebbles - 2 lbs Bag Promote the flow of positive energy throughout your home while giving your aquarium the 'finished look' These pebbles are between 1 - 2 inches and are great for personalizing your aquarium dcor. Feng Shui Pebbles look great when placed overtop of the biorb ceramic media, and come in ten different color varieties. Different colors are used to invite beneficial energies into the home and life. Clean, flowing, well-lit water with fish is the ultimate way of transforming bad energy. Feng Shui Pebbles are larger and more beautiful than regular pebbles. The recommended quantities needed will vary by tank size. See below for suggested guidelines.