Petco Black Lagoon Aquarium Gravel - 5 lbs., Gravel aids in propagation of beneficial bacteria. Adds depth and beauty to aquariums, water gardens, ponds and terrariums. Made of non-toxic fish safe materials and colors. Safe for use in freshwater and marine environments. - http://www.petco.com/shop/en/petcostore/petco-black-lagoon-aquarium-gravel
(link) DIY/ Homemade hides ~ supplies list: - Scissors - A sharpie to mark the cuts (optional) - Aquarium safe silicone (purchased for $4.50 USD per tube at Home Depot ~ used 4 - 2.8oz tubes, probably could have used LESS - Clean aquarium safe rocks/pebbles/gravel/stones. - clean plastic food storage container. (Rubbermaid, Gladware or Ziplock) - Some silk aquarium plants (optional) - Most importantly, a well ventilated clean flat work space & your imagination.