1. This Aquarium Hiding Rock is a good cave for fishes, shrimps to breed, play and rest. Betta, shrimp, guppy, snail will love it. 2. The Aquarium Hiding Rock is suitable for small fishes, easy to clean, good for nitrifying bacteria reproduction which can help to improve water. Ceramic material with granite pattern, safe and non-toxic for fishes. No Fading, No smell. No sharp or rough edges, no worry on scraping fins.