Used to speed up aquarium cycling by keeping fish safe from harmful ammonia and nitrates and to recover aquarium from mini cycle following ammonia spike, kept fish happy and safe. Can also be used as part of regular maintenance but not necessary once tank is properly cycled.
Note, to use this properly for introducing fish to a new tank then you must add the safe start and leave the tank for 7-10 days to allow the natural friendly bacteria time to grow. The more you stock your tank, the slower the cycle process will take, and the more of this you will need. But it will get you there eventually!
And do not worry about high ammonia readings when using, this is to be expected and the ammonia is neutralised by this product. Just do not let it get above 4ppm. If ammonia levels rocket, use a little more safe start, a drop of Prime or Tetra Ammonia Safe to reduce and keep fish healthy.