I got one of 6 discus swimming up side down, side way and panting a lot. There is no sign of sickness i.e no dark colour yesterday still eating but when I got home this fish always hides in the corner. The ammonia level is a bit high 1.2, PH 6.5. Please help me what to do I already raised the temp 32 It is breaking my heart when I see him or her going to die. Thank you

Ps: I don't have QT tank