aqua_holic
Aquarium Advice FINatic
That tells me that you just didn't transfer enough media. Both ammonia and nitrite consuming bacterias are present, and working, but they are playing catch up. They'll get up to speed soon, but you need an ammonia source in order to continue to grow them.
What is the turnover rate of your filter? That plays a significant role as well, since the faster the water is run through the filter, the lower the standing concentration of ammonia. A low turnover rate can allow the ammonia and nitrite to build up to levels that the bio filter cannot handle yet.
What is the turnover rate of your filter? That plays a significant role as well, since the faster the water is run through the filter, the lower the standing concentration of ammonia. A low turnover rate can allow the ammonia and nitrite to build up to levels that the bio filter cannot handle yet.