Miss Wiggle
Practically perfect in every way
long term no - when you do your weekly water change the filter will have the little extra blip of ammonia sucked up and processed within an hour or so, you may find it's advisable to do smaller but more regular water changes, like 15% twice a week instead of 30% once a week. But really it won't make any tangible difference.
short term, yes the ammonia is likely to damage your fish, but there's nothing else you can do now. This is why we always tell people to fishless cycle wherever possible but sometimes for whatever reason they end up fish-in cycling. If this is the case then all we can do is damage mitigation to try and keep things as good as is possible and reduce the chances of any ammonia or nitrite damage. However it's not possible to completely eliminate the risk in this case, if it was then there would be no need for a fishless cycle at all we'd just all do this magic cure that got rid of the ammonia!!
short term, yes the ammonia is likely to damage your fish, but there's nothing else you can do now. This is why we always tell people to fishless cycle wherever possible but sometimes for whatever reason they end up fish-in cycling. If this is the case then all we can do is damage mitigation to try and keep things as good as is possible and reduce the chances of any ammonia or nitrite damage. However it's not possible to completely eliminate the risk in this case, if it was then there would be no need for a fishless cycle at all we'd just all do this magic cure that got rid of the ammonia!!