Removable feeding tube, where you can place food inside.
Strong suction cups to hold the trap in place. First remove the thin plastic cover on the suction cups, loosen the suction cup`s screw, press the suction cups...
This is a fired ceramic disk that does not need to be soaked before using. No post means they are easy to re-position on egg crate or your frag rack.
The larger size is great for grow-out of your favorite corals.