Aquarium Systems HoldFast Epoxy Stick is a versatile, non-toxic adhesive designed for both freshwater and marine aquariums. It allows aquarists to securely bond rocks, corals, slate, and other materials, facilitating the creation of caves, cliffs, and walls within the aquarium. The epoxy is safe for all fish and invertebrates, ensuring a secure environment for aquatic life. Its easy-to-use, hand-mixable formula sets quickly, providing a reliable solution for aquascaping and repairs.