I don't know if stress coat removes ammonia or not, but as mentioned earlier, if it just removes chlorine, and your municipality sterilizes the tap water with chloramines (a more likely scenario) than the water conditioner will just eat up the chlorine and the ammonia will be released into the water column, since chloramine is chlorine bonded with ammonia to keep the sterilization lasting longer.
Letting your chlorine evaporate for 24 hours will have the same effect, the ammonia (if chloramine is used instead) will be released. Personally (I have a 120g and 90g, 6 tanks in total) I let my water age anyway, to let it off -gas, but I still add Prime right before I add the water during a water change to make sure I am not adding ammonia to the tank.
I only use Prime, , am careful not to overdose, it does not seem to create excess algae and goes a lot further that way. I have had good results with it.
Last edited by angelcraze; 10-10-2013 at 12:12 PM..
Reason: wanted to add