Removes organic waste compounds efficiently.OF NANOSKIM effectively skims the waste materials off thus preventing bacteria from decomposing these organic compounds to nitrate and phosphate. Easy Maintenance - For aquariums up to 60cm.OF NANOSKIM is designed for easy removal of organic waste compounds from your marine aquarium. Removable Collection Cup.The constant upwards airflow forces the foam into the collection cup which can then be removed. Lime Wood Air Stone.Fine bubbles that are created by the air stone traps dissolved organic waste compounds and from a dense foam at the water surface. Can be installed in aquarium or filter compartment. Suitable for the aquarium up to 25 GAL. OF NANOSKIM is designed for easy removal of organic waste compounds from your marine aquarium.