When you take this fake lionfish， please note that it's connected by a thin line. On the other end of this line， there is a sucker. Set this sucker at the bottom or side of fish tank and adjust the line's length. Environment friendly made material， no harm to aquarium creature，a great place for nitrobacteria.Use surfing pump to get more lively effect.It's recommended to install LED aquarium light to reach the best view effect. Length: 13cm Width: 3cm (about)Main body color: yellow， whiteMaterial: soft plastic 1 x Artificial lionfish