Rock Cave 6.7" Aquarium Ornament Decoration Fish Tank Stone Mountain View Resin - Ornament is made from non-toxic plastic material and makes an exciting ornament in any aquarium. - Offers the natural environment feeling. - Change your aquarium into a beautiful scenery . - It is vividly and color detailed to add lively and natural life to your tank. - It is great to decorate your aquarium all the time with minimum responsibility and maintenance. - They're are absolutely safe for fish and best of all, they won't die, rot or cause any algae problems.