The most common cause of Brown Algae or Diatom Algae is high Silicates in an Aquarium. Silicates support the growth of diatoms in freshwater and marine aquariums. Sera Silicate clear easily and permanently binds silicate.
Sera silicate clear is delivered with a practical filter media bag. Briefly rinse with running water before use, then simply place in a filter or a place with good water circulation. Remains active up to three months, depending on the silicate level.
500 g (1.1 lb.) are sufficient for an aquarium holding 200 - 400 liters (53 - 106 US gal.).
The sera SiO3-Test kit allows to reliably monitor the silicate level.