Before placing the cave in the tank, rinse before use, even after boiling or soaking. A "post-boil soak" in fresh water with a bag of activated carbon is a recommended step, too. Although we obtain our products from sources known to be free of pollution, impurities, and pesticides, you can never be too careful, and the extra step is worthwhile, in our opinion. It has traveled a long distance to make it to your aquarium.
Note: The coco hut received might have a natural hole on top. If size of your fish is exact fit in the hole, it might injure the fish. Please seal it by placing a larger stone or a plant on the hole.