It was an established tank that was a mess,Cleaned up the filter, changed the media ect.. I changed the water almost completly 2 times by vacumming the gravel so much. Added prime as bottle says. I've checked my ammonia = 0, nitrites = 0, nitrates =.5
When you say you cleaned the filter and changed the media - did you actually clean the filter and replace media? If so, you likely lost most of the bb that made the tank an established one.

