Sad news on your fish.
IMO is "in my opinion". Systematic refers to through-out the body.
The pop-eye (mostly likely from internal fluid build-up or the growths) suggested there was more going on then we could see on the surface with the growths. That and the not eating point to internal problems in the fish.
Is there anything else in the tank? If there is, several small water changes so as not to stress fish by e.g. doing one large 70% water change. If not, several large water changes are fine.
That medication will target both good and bad bacteria / virus. If you have other fish, there is a chance it will kill them. The bacteria are always in your tank and fish are normally healthy enough that it doesn't bother them. So simply bombing a tank with meds doesn't work - I've tried that. Something as simple as doing a large water change using water not roughly at the same temperature is enough to stress fish to the point of infection.
Weekly water changes, a quality food and a water test kit (e.g. for nitrates) is the starting point here.
IMO is "in my opinion". Systematic refers to through-out the body.
The pop-eye (mostly likely from internal fluid build-up or the growths) suggested there was more going on then we could see on the surface with the growths. That and the not eating point to internal problems in the fish.
Is there anything else in the tank? If there is, several small water changes so as not to stress fish by e.g. doing one large 70% water change. If not, several large water changes are fine.
That medication will target both good and bad bacteria / virus. If you have other fish, there is a chance it will kill them. The bacteria are always in your tank and fish are normally healthy enough that it doesn't bother them. So simply bombing a tank with meds doesn't work - I've tried that. Something as simple as doing a large water change using water not roughly at the same temperature is enough to stress fish to the point of infection.
Weekly water changes, a quality food and a water test kit (e.g. for nitrates) is the starting point here.