Fish can swim comfortably between the figures. Suitable for aquarium and terrarium, fish tank decoration, living room accessories, bathroom decoration, garden decoration, family decoration. The figures and objects are best kept stable , if they are fixed somewhere in the aquarium or terrarium, or if there is sand in the aquarium/terrarium. Just put the figures lightly in sand to make things hold better and more securely on the bottom of the water or terrarium stay.