The TMC Natureform Coral Tube Sponge Yellow/Green Aplysina sp., with dimensions of 15 x 13 x 18.2 cm, is an artificial representation of a tube sponge, specifically designed for marine aquariums. Its vibrant yellow and green colors and unique tube-like structure closely mimic the appearance of a real Aplysina sponge. This decorative piece not only adds visual interest to the aquarium but also serves as an intriguing and safe habitat for small fish and invertebrates, without the need for the care that live sponges require.