The Smoothedo-Pets Fish Tank Decorations Aquarium Decoration Medium-Sized/6.3inch Tall Castle Ornaments Accessories Fish Hides Retro Asia Style House (Palace/Tianshou Pavilio) is a great way to add some style and color to your fish tank. The set includes two mini grass plants and two large grass plants, all of which are made from environmentally friendly materials that won’t cause any discoloration issues. The house itself is made from durable plastic that will last for years.