you will keep seeing spikes in ammonia, nitrite (more dangerous) and some nitrate till it cycles completely.
You will know your tank has completed its cycle when the readings are Zero Ammonia,Nitrite( v dangerous to fish, converted as food by plants/bacteria) and 20+ nitrate (less dangerous and converted as food by plants and bacteria). Should take month. testing weekly is recommended in fully cycled tank, till then, you can test waters as fish suddenly appear stressed.
You will know your tank has completed its cycle when the readings are Zero Ammonia,Nitrite( v dangerous to fish, converted as food by plants/bacteria) and 20+ nitrate (less dangerous and converted as food by plants and bacteria). Should take month. testing weekly is recommended in fully cycled tank, till then, you can test waters as fish suddenly appear stressed.