Hi phoenix, I've just read this from the beginning and something is jumping out at me. Are you using API master kit? You mention you are using prime - which I understand is fantastic stuff (I don't use it myself, I use stresscoat) but I read on a thread - I think started by Kissfn - that prime and API test kits don't mix, something to do with stalagtites ...
It's just a thought, but if that is the case you may be getting false readings.
I've been in your position and I know how frustrating it is. I got so fed up of changing buckets of water that one day I just burst into tears. I got some advice from my lfs (as I'd popped in for something) and they suggested that I didn't feed for 3 days and left the water alone. In 3 days my tank went from the same position as yours to cycled.
I understand that you are worried about your fish but with a low PH the ammonia is actually Ammonium and not as harmful (again, read it on here somewhere) so it could be worth a try - just keep a close eye on the fishes behaviour.
It could also be worth looking up posts by Kissfn and seeing if you can find the thread I'm remembering.
Good luck with it
It's just a thought, but if that is the case you may be getting false readings.
I've been in your position and I know how frustrating it is. I got so fed up of changing buckets of water that one day I just burst into tears. I got some advice from my lfs (as I'd popped in for something) and they suggested that I didn't feed for 3 days and left the water alone. In 3 days my tank went from the same position as yours to cycled.
I understand that you are worried about your fish but with a low PH the ammonia is actually Ammonium and not as harmful (again, read it on here somewhere) so it could be worth a try - just keep a close eye on the fishes behaviour.
It could also be worth looking up posts by Kissfn and seeing if you can find the thread I'm remembering.
Good luck with it