Dying fish -- diagnosis? with pics

[Kinbote]

fungal infection, not sure what to do about it..... try cotten soaked in water, dip it in povidone iodine, take out the fish, put it on a wep towel and wipe it off. be gentle, and if it doesn't come off, bring them to a vet, and have them remove it.

All the sick fish already died, sadly. I've had the survivors in quarantine for just about four weeks now, and I'm just wondering whether there's a chance that they're carriers now or if it'll be safe to put them into the new tank with other fish.