If you're wondering what string is safe for aquariums, the answer is that it depends on the material. Some strings are made of materials that can break down in water and release toxins, while others are completely safe. It's important to research the string before using it in your aquarium.
One type of string that is safe for aquariums is nylon. Nylon is a synthetic polymer that is strong and durable. It won't break down in water and release toxins, making it a great choice for fish tanks. Another option is polyethylene terephthalate (PET). This synthetic resin is also non-toxic and won't leach chemicals into the water.
If you're looking for an eco-friendly option, consider hemp or jute. These natural fibers are biodegradable and won't harm the environment if they end up in landfills. Plus, they're absorbent so they won't leach chemicals into the water like some synthetics can.
No matter what type of string you choose, be sure to wash it thoroughly before adding it to your aquarium. This will remove any dirt or dust that could contaminate the water and harm your fish.