Is neem oil safe for fish? What natural remedies treat fish diseases?

Pimafix is an acceptable "natural" antifungal treatment. Melafix is for bacterial infections. Kanamycin, erythromycin or metronidazole are good broad spectrum antibiotics. Fungus Cure (by API) is an excellent antifungal. You can find these medications in the aquarium section of most pet stores or even online. Follow label directions carefully and remove the carbon filter insert during treatment if indicated. The cornerstone of any treatment is to first maintain pristine water quality and stable chemistry.

No, I would not do this. There are concerns that neem leaves and the oil they contain can be toxic for cats, and it will not cure Misty's fungal infection. Cats often lick off any topical application, so in order to treat fungal infections in cats, oral medications are needed. You should take Misty into the vet to get the correct oral medications to treat her fungal infection.

While some essential oils can cause problems for dogs, usually this is if they are ingested or applied topically. The very small amount that would be in the air when these products are used would not be harmful. If Tiny has chronic bronchitis or other respiratory disease it might be best to keep him out of the room when you are using these since any aromatic compounds could cause irritation, but if he does not have any underlying medical problems I wouldn't be concerned.

Yes, neem leaf tea is safe to use for budgies as a bath or mist. You should have Nobita examined by your veterinarian to rule out or diagnose mites or skin infection, then clean and sanitize the cage, bowls, toys and perches. Discard anything that cannot be sanitized.

Monitor water chemistry using a home test kit or submit a water sample for testing. The local Petco may do this for free or for a small fee. Aim for an absence (0 ppm) of ammonia and nitrites with nitrates at 20ppm or less. Perform partial water changes to stabilize chemistry and/or to improve water quality. Use only conditioned water that is temperature matched to prevent stress or shock. Pristine water quality is the foundation for healing and recovery from infection or injury in fish. You can use plain aquarium salt (NOT table or Epsom salt) as a general tonic to reduce stress, improve gill function and aid in recovery. Dissolve 1 teaspoon of salt per gallon of water in a cup or two of water and gently pour it into the tank. Treat for 14 days then reassess the condition. An "all in one" product, such as Lifeguard (by Tetra), can be used concurrently to treat infection or parasites. Find one in the aquarium section of the local Petco. Follow label directions carefully and remove the carbon filter insert during treatment if indicated.

Non-iodized salt can be used as an immersion bath (short term) at 10-30 g/L for up to 30 minutes. Keep a close eye on the fish for stress or rapid respiration as some fish can only tolerate the higher dose for minutes. This can be repeated every 2-3 days. It is difficult to determine in the pictures whether this is a parasitic problem or not. Black areas can be the result of melanin pigments, a sign of trauma. A visit to a veterinarian acquainted with fish could perform a skin scrape and examine under the microscope for a diagnosis. Good luck.

At the proper concentration, Neem Oil is generally considered safe. It is not listed as a toxic plant product for pets per the ASPCA Poison Control Center or Pet Poison Helpline. In its undiluted form though, Neem Oil can potentially irritate the skin surface, especially on already-irritated skin, or if left on for more than 24 hours at a time. In addition, if a non-diluted or insufficiently diluted product is used on a pet and the product is consumed, then a pet could exhibit excessive salivation, appetite changes, vomiting, and/or diarrhea. At the dilution rate you described there should be no issues and I think it will be fine to use. Hope this helps. Best wishes.