SODIAL Green Fake Plastic Water Plants for Fish Tank Aquarium Ornament It provides a beautiful decoration for your aquarium, also is an excellent hiding place for fish which adds extra fun to play. They are made from durable plastic, and suitable both in salt and fresh water. Designed with a weighted base, so they can stand firmly in the tank. They are absolutely safe for fish and best of all, they won't die, rot or cause any algae problems.