Perfect for 36"x 15" Aquarium.This Artificial Grass mat ornament adds natural look within 5 min to your aquarium. Within 5 min,it converts your aquarium.It is very easy to put it in your aquarium.No need to empty the tank or remove your lovely fishes.Just once wash the mat under running tap water & put into the Aquarium.While putting in aquarium, remove air bubbles under the grass mat & add some weight like stones or pebbles if necessary.As it is made from very soft material it can't harm your fishes.It not only give natural look but also give a clear water look,as it help to settle the minor particles in the water.Whenever you clean the aquarium just wash under the tap water & put as directed above.