Natural gravel containing bio-activated live nitrifying bacteria, perfect for helping to cycle a new aquarium. Can be used either a primary substrate or mix with substrate for a healthy aquarium. Contains live nitrosomas and nitrobacter bacteria which break down and convert harmful ammonia into nitrates. DO NOT RINSE BEFORE USE and dechlorinate water before filling tank. Sahara gold is a natural New Zealand river sand containing no artificial colours & is pH neutral.
