PLEASE HELP

The rain water cancels out the ammonia and the ph. The chlorine is from the tap water not the rain water. It makes it good for my goldfish
 
Not nitrate (NO3) as you already posted that, I'm asking about nitrite (NO2).

Any chance you can post a pic of your fish so we can help.
 
I'm sorry for your loss. Due to inbreeding/deformities short bodied goldfish have a lot of genetic problems, next to the regular goldfish issues. Please make sure to read this link:

 
AquariaCentral.com