While low levels of phosphates will not harm your fish, plants or invertebrates, high levels of phosphates will lead to algae blooms. Levels of 1.0 ppm are favorable for algae growth and at 2 to 3 ppm, algae growth is very likely to occur. Ideal phosphate levels are 0.05 ppm, or less. If phosphates persist, the aquarium phosphate removers on this page will help to reduce your phosphates. Some of these aquarium phosphate remover products will require the use of a media bag or a reactor. A media reactor will more efficiently remove phosphates from a tank because it will increase the efficiency of the phosphate-binding media by ensuring maximum water-to-media contact and prevent the media from compacting, leading to lower nuisance algae growth and healthier corals in your reef tank. We have reactor packages that include the phosphate remover. You may also want an Aquarium Phosphate Test Kit. Related Products: Aquarium Reactors I Media Bags I Phosphate Test Kits.