The 120 is all cycled, only 10PPM of nitrate left over. My question is how many people do the secondary ammonia spike? What I am saying is that when the tank is cycled, how many people spike the ammonia up to 2PPM again and test again in 24hrs to see if it got back down to zero? I'm thinking about doing this but was also debating doing a water change to get that nitrate out of the tank. If I do the ammonia spike should I do the water change after?