ok thx, will wait indeed for the tests NO3 NH4 & copper.
Okho stone don't add anything in the tank. I have had them for years now.
Checck this interesting video:
PH has always been stable around 6.3
I wouldn't do anything that drastic at this stage and get the Ammonia and nitrates tests, even if you start it off again you won't have the testers to know where the cycle has progressed to, or if it is working etc!
I had a problem when I added stone to my tank, and the PH increased, I assume triggering a new cycle from less harmful ammonium to the more harmful ammonia? Has your PH increased at all since the tank was set up with the dragon stone, I think that increases PH?
For this part what should I do? Empty totally the water and restart cycle? And clear external filter? Should I remove the roots also: they potentially still have treatments left inside de wood?
I rechecked the Nitrite value and it's less that 0,01
Could it be either Nitrates &/or Ammonia issue ?
Thanks for your help