Mushroom House can provide an excellent shelter for small shrimp and betta Fish, decorate your aquarium with minimum maintenance. It is safe for all terrariums, aquariums, fresh water, salt water, do no harm to fish and other aquatic animal. Usage: use the cool water (ONLY) to clean it and don't need to clean by brush, and soak it for three hours, then leave it a day before putting it into tank. Attention: 1.Avoid high temperature; do not use the hot water to clean it. 2.This is not natural Color it will have a little faded. Item Size(approx.): 8cm x 8.5cm/3.3" x 3.1"(L*H). Package Include: 1 x Mushroom House Aquarium Decoration