Aquarium equipment includes various tools and devices that help maintain a healthy environment for fish and aquatic plants. Essential items include filters, which clean the water by removing debris and harmful substances, and heaters, which regulate the temperature to keep fish comfortable. Additionally, lighting is important for plant growth and to showcase the beauty of the aquarium. Other useful equipment includes air pumps that provide oxygen to the water and substrate, which is the material at the bottom of the tank where plants can root. Accessories like decorations and plants not only enhance the aquarium's appearance but also provide hiding spots for fish, creating a more natural habitat.