Oscar sick in hospital tank, how long b4 return?

Hi,

My oscar (4") was sick with what i think was hex. he stopped eating now for a week and a half and i have moved him into a hospital tank (10G) treating him. as well as treating (and fished treating) my main (180G tank)

question is.. since this was my last day treating him a lone in the tank (7 days) with metro. he is looking a little better but isnt acting right ..( laying at the bottom etc).. how long do i wait to re enter him into my main tank? he still isnt eating. but i think he may be depressed/stressed in the hospital tank (10G), however i am afraid to re enter the parasite if he isnt completely treated.. any help is greatly appreciated!.. thanks!

ive been doing water changes every day in the 10g ... he is only 4" and it was the only altenitve i had, he wasnt doing well. and the other fish i had sensed it and was beating him up bad...

my main concern is getting the big tank sick again, if he isnt fully "better".. since he still isnt eating..

should i re enter in him the 180? or wait till he starts to eat again (im done with the meds - metro for 7/8 days )

thx all

I'm still debating what to do.. He looks better but still isn't eating.. A couple more days in the tank or just put him back in the big one , just don't want to risk infecting the tank again... Hmm

Ok .. So I decided to re enter him into the 180g and right away he was beat up (GT) so I put in a temp divider and my uaru got through and beat him up! (Which was surprising) . So I chased him out and now my oscar is beat up and still not eating (2weeka already with a week of metro treatment)... I don't know what else to do? Just wait and see if he recovers or dies? Euthanize him to end the pain? .. I don't have another tank to put him in and I don't know anyone who would take a "sick" but possibly recoving fish... Any advice would be greatly appreciated. Thanks!