hello every one ;
I have two PB discus in hospital tank 80 liter.


They were 2 in a batch of 10 juvies that i bought 5 months ago and they are 7 months old ,they were in a 200 liter tank ,not planted BB the other 8 discus are good eaters but these 2 were fussy eaters till about 3 weeks ago they almost stop eating . my parameters are ph 6.8 ammonia 0 nitrite 0 nitrate 5 gh 2 kh 0 temp 29
Three weeks ago i transferred the 2 PB to a hospital tank ,filled it with 40 liter of water increased temp to 33 c put an extra air stone and add a cycled double sponge filter

I have treated them with metronidazole 400 mg for 40 liter ( 10 mg per liter ) for 12 days ( 6 times with 1 day rest in between ) 50 % water change prior to medication and lights off during treatment , today i have noticed that they are breathing faster roughly 2-3 time per second so i have done an extra 50% W/C and put 1 table spoon of rock salt per 40 liter and they are breathing a bit slower but still refuse to eat , you can see the razor blade look on their face .
Any suggestion of my next move would be greatly appreciated.
Sayid