Blind Salvini

Hello.I have a hybrid salvini thats seems to be blind for a month or so.I thought i was crazy cause he was eating so far.It's like he was waiting for the food when the food was already there.After spawning with a fh female i had to move him in an uncycled tank because of the fry.There were getting through the divider and eating them.Now he's in 100 l and not eating at all.Poking the water around the food,poking the filter.He seems kinda down after spawning also before i moved him,stayes most of the time at the bottom of the tank.
His eyes look fine to me and the body.He only has ambiental light only turning it on when checking them I'll upload some recent pictures.Thank you and please help.

Please anyone!!!!.He kept banging on the walls the rocks he seems like in agony..now his eyes turned cloudy in some areas.Schould i terminate him?

I did the tests last night.
cl-o
ph- here is variable cause cant seem to find the exact match its between 7.2 and 8.0(more pink)
kh-6d
gh- 8d
no3-10
no2-1

I also added FMC from dajana.Was deperate and the guy from the pet shop told me it might work..but no improvements so far.How much salt do i add to 180 liters?What kind of salt and should i remove the other fish from the tank..i also have a labiatus in there.Thank you

What do u think it might be?The problems started a month or 2 before i moved him but nothing to obvious.Should i treat with general antibiotics?

Thanks a lot.Already added salt.The lab seems to be displaying one symptom..not eating although he can see.The salvini started eating again a few days after adding fmc from dajana but he's still partially blind,cant tell the distance and he struggles catching the food.Maybe the uncycled tank made it worse but still got to figure out why he lost his eyesight in the first place.Worried that the fry and female might get it too .
Thought about parasites too,just to clear that out but have no idea what kind of medication is best to cover most of them.Any clues?
My tank temperature is 82.4..no AC to cool it down Also added some 4 big shells to the tank to raise the ph a bit.
Thanks a lot again for your help.

Are the fins and body supposed to be goldish?i see a fine gold film.Not like the velvet disease,that looks like gold dust.Could it be velvet?