Having issues with mushrooms, zoas, leathers and other coral not sticking to the frag plug? Simply put your frag media into container, add your coral such as a mushroom and close the container with its positive lock system. It allows water and light to flow through without the coral being blown away. Can also be used as acclimation chamber if suspect to bring nipped on by other tank mates. Provides a safe shelter for multiplying.

Diameter 3 1/2

Depth 2 1/8

Black reef safe Plastic