Wound Treat, Bio Bandage, Stress relievers. Look for and remove bully fish. Medications: Melafix
When treating hospital tanks with medication, I generally like to hold off on feeding (to prevent waste and ammonia buildup in the tank). If I do think my fish will need the additional nutrients, I will feed a small amount about once per day. You can add a few drops of or something similar to the food, letting it soak for a few minutes before feeding – this may help improve recovery of both the parasite and bacterial infection (plus, garlic juice is wonderful for enticing fish to eat if they won’t eat otherwise). If your goldfish is too weak to swim for its food, you can try handfeeding it (make sure to always rinse off your hands well to remove any residue from soap, grease, or lotions – preferably, it’s better to use latex gloves).
Many organic treatments such as Melafix can last for years past their expiration dates (I used some Melafix that was two years past its date with positive and measured results). Most Chemical Treatments such as Cupramine (Copper based) or Quick Cure (Malachite Green, Formalin) have no practical expiration date. By Practical, I mean chances are the medication will out last you and your fish. At most the copper in Cupramine might precipitate out of the solution, but often a good skaking can remix the product.
Buy fish medications for aquarium fish diseases online - Pet Mountain
Parasite and Fungal Medications for Fish - Angels Plus
Unfortunately most sick fish won't eat. Instead, place the fish in a 5 gallon bucket or tank with a small heater and airstone. Medicate the water in the bucket. Change the water every 1-2 days by throwing out the old water, replacing it with water from the tank andadding new medication. Not only is this safer for the remaining healthy fish in the tank, but it also water changes the tank, reducing toxins which may have precipitated the disease. I prefer this method over normal hospital tanks because extra tanks are a pain to maintain and their biofilters are constantly killed by medications. Buy a 5 or 10 gallon tank or bucket, heater and airpump, and use it when you need it!I think it's worth pointing out that any off-the-shelf medication is not guaranteed to cure your fish. What you have got to remember is that when a fish becomes ill, they will require the same sort of attention as your pet dog would. When our non-aquatic pets become ill, a lot of us take them to the vet straight away, very few people do this with fish. If you go on any fish related website, at some stage you will read about somebody who has used every medication they can obtain and it still doesn't work. Well, unfortunately sometimes off-the-shelf medication is just not enough, antibiotics are needed and these can only be obtained from the vet in a lot of countries. Ask anybody who keeps expensive koi carp, they will tell you just how expensive medical bills can be.I thought I would be fair and list three popular companies that manufacture aquatic medication around the world. I obtained this information from Charterhouse Aquatics where you can purchase all of these medications.Aquarium Pharmaceuticals MelafixHeals open wounds & abrasions, treats fin and tail rot, eye cloud, mouth fungus and promotes regrowth of damaged fin rays & tissue. Will not adversely affect the biological filter, alter the pH, or discolour water. Safe for reef aquariums and live plants. For use in fresh or salt water