Can you use perlite in marine aquarium?

Yes, perlite can be used in marine aquariums, primarily for filtration purposes or as a substrate. However, it is essential to ensure that it is clean and free of any contaminants that could harm marine life. While perlite provides good aeration and drainage, it is not commonly used as a substrate in marine systems compared to other materials like sand or crushed coral. Always monitor water parameters closely if you choose to incorporate it.