https://www.patreon.com/Somainkdesigns The Three Categories of Rocks You Can Use In Your Aquarium. Can't afford dragon stone or wonderstone at $4.45 a pound? Have no fear, Im going to teach you all a bit about which rocks you can use in your fish tank, which stones to avoid, and why. Also in my customary long winded style, Ill be discussing the background of how Igneous, Metamorphic and Sedimentary Stone is formed and how you can equip yourself with that knowledge to enhance and beautiful your aquascapes!