Sera gravel beige is CO2 proof and neutral towards water, i.e. it has no influence on water parameters and does not tint the water. Due to a grain size of 2 4 mm, plants can grow on excellently. Due to being round grained, the natural gravel is also suitable for keeping bottom oriented fish such as catfish
Sera gravel ocher is evaluated according to an independent institute, and is proven to be pollutant free. It is therefore also suited for keeping and breeding sensitive animals