Aquarium decor in the shape of a skull.

Aquarium decoration in the shape of a skull. Skull decorations in aquariums are common and used to add a mysterious, historical, or pirate theme to the tank. It is a functional piece as much as it is aesthetic. The main and functional features: Safe material: Usually made of resin or high-quality polystyrene, which are inert and completely safe for the aquatic environment and fish. They do not react with the tank water and do not alter pH levels or water chemistry. Design and details: Realistic imitation of a skull structure, highlighting the details of the teeth, facial bones, and eye sockets. Comes in colors that mimic decayed bone (usually light beige or dark gray), and some models are covered with artificial algae or have drawings (such as roses or ancient patterns) to increase realism.