I put the filter in line with the system to help filter the ammonia.

So should I replace the tank water with this city water? I was worried about big swings in PH, with the little fish in here. But I guess if the ammonia kills them we are in a greater evil scenario.

Should I let new water set for a while to help evaporate the chlorine.

I have made sure I shake the ammonia bottle #2, the ppm test is going all the way to the green it may be more than 8 ppm.

How much exactly is a DO test, and perhaps I should go out and get a air stone and pump.

The water temp is around 75 F. I just tested the ammonia again it is 8 ppm right now. Should I continue with the water change, if so should I filter the water or let it set first?