I just ordered some Ammonium Chloride and will start adding that when it comes in. Adding manually I think is best??
I personally let my dosing pump handle it because I prefer to add very small amounts very frequently instead of dumping in a lot of ammonia at once. However, I started with dosing manually and this worked as well. Only if there is a lot of nitrogen demand and you won't see any changes in nitrate over time you might need to use a dosing pump if you don't want to dump in too much ammonia at once.