IDS Home Aquarium Ceramic Shrimp Shelter Ornament for Fish Tank, Set of 5 Recreate the look and feel of their natural habitats, create a natural ecological environment For aggressive, injuried fish, shrimps, small fishes, marine fishes rearing, breeding and shelter Made from ceramic material which could filtrate the water, safe and non-toxic Approx. Size: 0.78" x 0.78" x 0.78" (20 X 20 X 20mm) Set of 5 pieces fish tank ceramic shrimp shelter ornament