The laying holes in the hotel are closed at the back, making the hotel perfect for the breeding of L-Numbers. The hotel is very suitable for aquariums with multiple L numbers so that the L numbers can choose for themselves which laying hole they like. You can also cover them with mosses or plants. The plants grow very well on the slate as there are various minerals present in the slate. These minerals have a positive effect on mostly red plants and are not toxic to tropical fish, shrimps or other aquarium inhabitants.