Note: The "Luminous Effect" only occurs under actinic lighting, ultraviolet light or blue light, which brings a fantastic view of the ocean world to the fish tank.The Glowing mushroom is made high quality of material (include:Silica-gel,Environmentally friendly paint and UPR),which looks extremely realistic and natural .Apart from this,it is non-toxic to your fishes.Don’t worry about the safety of your fish. This aquarium ornament decoration can personalize your aquarium with a distinctive creative look. At the same time ,it provide shelter for your fish. 4 in 1 Glowing mushroom set,which can let you mix and match .Make your aquarium more special and vivid. Here is a Sucker which can be fixed on the bottom of the fish tank,make it stand stable. Satisfaction Guarantee : Your satisfaction is our top priority.If our product have any problem make you not fully satisfied,Please send an email.We will provide the best solution for you.