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
nitrate in aquarium is 6d and 3D in tap waterWhat is nitrite? Both in the aquarium and tap water.
I don’t have a test for NO2 and yes I canNot 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.
UPDATE: in absolute tears but going to have to euthanise greg tomorrow, just getting worst and hate to see him suffer. No one knows what up and I’ve tried everything. So sad to see him go