The reason you have ammonia is because you killed some of the beneficial bacteria in the move. This also happens often when doing large water changes. If you increase your filtration your bacteria colonies will grow larger and able to cope with shocks to the system better. For now I would hold off feeding for a couple days and keep an eye on your levels. Your ammonia should drop down and you will see a spike in your nitrite levels. After your nitrite levels peak they will start to drop and you will start reading nitrate levels. At this point everything should be back to normal and you will need to do a water change. I would definately add some more filtration though.
