Seachem MultiTest Phosphate measures inorganic phosphates down to 0.05 mg/l, producing a unique and easy to read yellow-green-blue colour range in marine and freshwater. 75 Tests. Phosphates, together with silicates are often responsible for nuisance algaes, particularly within reef aquarium.

Should you have an issue with algae within your aquarium, test for both silicates and phosphates. Should you find high levels of either, products such as Rowaphos or Seachem Phosguard can be used to reduce them, and increase the number of water changes you undertake. Before this however, it’s also a good idea to check your tap water – as if you have high levels of phosphates and silicates in your tap water, water changes won’t help. In these circumstances, the best approach is to swap to Reverse Osmosis (RO) water, which will have the silicates and phosphates removed.