- For Freshwater or Saltwater - Excellent for planted aquariums, terrariums - Rust-proof and oxidation resistant - Durable and precise Greenosis Black Stainless Steel Tools are great for freshwater planted aquariums and terrariums. As they are made of a high quality stainless steel, they can also be used for saltwater aquariums. In addition to aquariums, they are also great for indoor gardens, reptile tanks and many other applications.