No Sharp Edges: Aquarium tree trunk imitation is free of chemicals. It is safe for betta, Shrimp, little hermit crab, fish fry, small fish. very detailed, no sharp edges, to let the fish shuttle freely among them, add underwater nature landscape to your aquariums or fish tank. Betta Fish Friendthere are 5 holes on the trunk fish decor, your lovely pet betta or other smaller fish would be super happy to go in and out the trunk cave to sleep, rest, hide, play, breed. Light Weight This Log Resin Hollow Tree Trunk Ornament dimension is 5.3*4*2.7inch, perfect for use in small and medium size fish tank. Sturdy Resin MaterialMade of high quality resin, non-fading durable resin made, friendly for all aquariums and fish, suitable for both salt and fresh water. Stay in Place This Aquarium Hideout Caves Decorations has a flat base, and is completely hollow, will sit stably on tank bottom, no floating over. Put it into water and it's done. No further maintenance needed..Items from Sheng Xinshun's shopProducts from KJ's store