Features: Ideal for creating a realistic and colorful underwater world for fish tank or aquarium. Made of eco-friendly materials, with no harm to animals in the water. High quality transparent thread and powerful sucker make sure the jellyfish can float in the water for a long time. Thin thread and transparent sucker are both easy to hide. When using pump, the jellyfish will swing with wave. Lights illuminate the jellyfish creating a glowing effect. Note: The jellyfish can't glow in the dark. The glowing effect is working with lighting effect.