Bubble Decoration: Eco-friendly resin is made of non-toxic and non-polluting material and will not fade over time. Suitable for aquariums and circulatory systems. Create dazzling water streams and underwater scenes. For Air Bubbles - Connect this top hat to an air pump to increase oxygen and reduce carbon dioxide . Makes lots of small bubbles (excluding air pump). Enhance the natural landscape of your aquarium and energize your fish. Simple maintenance: the size is about 14 x 6.5 x 6.5 cm (L x W x H). Easily adapts to any aquarium. This decor will give you the ideal water view you’ve been dreaming of. Optimized design - manufacturing with great attention to detail - stable resin material for optimal grip. Requires no special maintenance and is easy to clean. HIGHLY DECORATED - Each decoration is meticulously packaged to ensure that it is complete, flawless and perfectly delivered. Designed for both freshwater and saltwater aquariums, it adds a touch of mystery to your aquarium and