sera snail collect is excellent for reducing the number of rapidly reproducing snails in the aquarium. With the help of a bait (e.g. sera O-Nip tablets), the snails are attracted to the trap. Due to the bars, the snails cannot turn back. The bars at the entrance of the trap prevent the fish from being caught. Alternatively, the sera snail collect can also be used to trap polychaetes in the saltwater aquarium.