A 100% reef safe Coralline Algae Colored Coral Putty that can be used underwater. This two-part silicone-based coral putty cures in 3 minutes. No foul odor, will not cloud the water, and will not cause the protein skimmer to overflow. Can be used for both marine and freshwater aquariums. The color of the putty allows it to blend in with its surroundings making it easier to hide than other forms of adhesives used in aquariums. It is recommended to use a minimal amount since most corals will grow over the adhesive in a matter of weeks.