Looking for advise how to treat this fish

[terror]

I have a big parrot dish, he's been with me for years now, a week ago , i transferred him to my 75 gal hospital tank as he was gasping for air in my main stingray tank. I noticed his gills seem to be swollen. I've treated with peazi 2 times in my main stingray tank as i also use prazi on my rays twice a year.
Thought i'd treat as i was sudpecting this parrot to have flukes, as i've read the gills will get swollen when infested? But after 2 treatments of peazi in main tank . There seems to he o improvement.

i moved him into my 75 gallon hospital tank and have been treating him with oceanfreeyellow
Powder. Since i've read flukes might cause infection on their gills. Its my 2nd treatment if yellow powder now but not much improvement. I did notice a black marking near his mouth has disappeared but so far he is still gasping for air during day time. At night i think he goes down?

any advise? There was a mole like growth under the moth before . Not sure if it could have been sting by my ray, but damage outside does not look bad , so i think that mught not be the case

 

[the loach]

With a fish like this one really needs to examine scrapes under a microscope before treating. Unnecessary and improper deworming has caused resistent strains of flukes, there can be other parasites that are unaffected by anthelmintic products. Don't know what Yellow Ocean powder is, some kind of anti biotic?
It could be an effect of the venom of the stingray?

 

[Sprinkle]

I'm so so sorry, but I laughed so hard at the photo. It looks funny, almost like trying to kiss you through the glass. Sorry, bad humour.
When a fish gets infected with gill flukes, the gills get red or pink ish in colour and the main symptom is gasping. In your case, this aren't gill flukes, but something else. What fish do you have in the tank that could possibly attack it til it got infected with something? T the loach has mentioned stingrays... You have a couple? This could porbably be the culprit as its poison and there is not much to do..
I would never keep stingrays with other fish, that's why.
Poor fish

 

[terror]

thanks I have him with 5 adult freshwater stingrays.
so far he is still in the hospital tank. I've treated with 3 treatments of antibiotics .
not sure what to do at the moment. he stays at the water surface a lot . I'm hoping he recovers. his color has become pale.
he does have a cute face

 

[Sprinkle]

I wouldn't keep him or any other fish with stingrays, personally I wouldn't. If he got stung by one, I wouldn't hope he would survive. Sorry