bought them for hideouts for the fish and they work great! Look wicked in the tank which is even better :) #rankboosterreview #sponsored #luffypetcollection #sponsored SunGrow Organic Coco Shrimp Cave : Comfortable Hideout for Shrimp : Perfect Breeding Area : Naturally Attractive & Non Toxic : Unique Aquarium Decoration https://www.amazon.ca/dp/B01N9UF50I/ref=cm_sw_r_cp_api_pW3IAbWR5QY1K