Dimart Exquisite Aquarium Fish Tank Decoration Ornaments Ceramics Water Plants Planted Pots(S, Deep Gray) Small bonsai stone is made of ceramics, it is use as a plant pot for aquarium aquascaping. Since ceramics water plants pots are hollow, they do not displace or reduce the amount of water in your aquarium. The hollow caves provides shelter and hiding spots, also they can be used as spawning sites. Eco-Friendly simulation stones ceramics aquarium decoration ornaments; No pollution, non-toxic, no harm to fishes. Unique underwater plant pot design. Use for planting and aquascaping in the aquarium or home fish tank.