Ammonia is 0Thsi make no sense... he was fine in H tank & started to play up in ur main? Would you mind post results for nitrite ammonia and nitrate?
Nitrites are between 1-5
Nitrates are 0
I even tried putting him into my smaller 5.5 gallon betta tank just to see if it was something in the larger tank, like maybe someone was picking on him, and he wasn’t doing it in there until this morning when I turned the lights on.... That tank is ammonia 0, nitrates 0 and nitrites between 5-10
Would there be something maybe light related going on? Maybe he doesn’t like the lights or something??