My guppy has red spots on her head. How to treat without quarantine?

It could be early ich (white spot) infection or another infection (bacterial or fungal). To be safe, separate him into a quarantine tank and monitor for any change. You can treat for ich as you did it in the past if indicated. Bacterial and fungal infections have different treatments, so I would be hesitant to recommend a specific medication without more information or a definitive diagnosis. You can use plain aquarium salt (NOT table salt or Epsom salt). As a general tonic to reduce stress, increase gill function, treat minor infection of many types and to aid in recovery. This can be added to the quarantine tank at 1 teaspoon per gallon of water. Treat for 10-14 days then reassess the condition.

This could be a fungal or bacterial infection. Less likely is a parasite. Maintain pristine water quality via filtration and regular partial water changes. Maintain water temp between 78 F and 80 F. Consider a broad spectrum antibiotic or an all-in-one type treatment. Either can be found in the aquarium section of the local Petco. Follow label directions carefully and remove the carbon filter insert during treatment if indicated. You can also add in some plain aquarium salt (NOT table or Epsom salt) to reduce stress, improve gill function, treat minor infection and aid in recovery. Dissolve up to 1 teaspoon per gallon of water. Salt can be used in conjunction with an antibiotic or other treatment.

Separate him into a smaller quarantine tank. You can use a broad spectrum antibiotic to treat him. Read package directions carefully and remove the carbon insert if necessary during g treatment. Plain aquarium salt (NOT table salt) can be used concurrently to aid healing. Dissolve 1 teaspoon per gallon of water into the tank. The Ich can be managed by gradually to about 86 F. Raise it no more than 1 degree per hour to prevent stress. This will speed up the life cycle of the parasite. Once the "dots" drop off your fish, you can vacuum the gravel daily and sanitize any tank furniture. Keep the temperature elevated for about two weeks to ensure resolution. Reduce the temp gradually after this time period. A medication such as API's QuickCure can also be used in conjunction with a temperature increase.

If you have another tank, it will make treatment easier. It will also preserve beneficial bacterial populations in the main tank since antibiotics may be used. The cornerstone of treatment and recovery is pristine water quality. Keep the water as clean as possible via filtration and regular partial water changes. Use only conditioned water that is temperature matched to prevent stress or shock. You can find a broad spectrum antibiotic in the aquarium section of the local Petco. Follow label directions carefully and remove the carbon filter insert during treatment if indicated. Once the fish has recovered, you can return it to the main tank. If you don't have a "hospital" tank, you can treat the main tank.

The white fuzz may be Columnaris, an infection causing bacteria, or a fungal infection. It can be difficult to differentiate without microscopic examination. Either can be managed/treated via partial water changes, plain aquarium salt (NOT table salt) and medications. Partial water changes, no more than 20-30% daily, will stabilize chemistry and maintain or improve water quality. Use only aged or conditioned water that is temperature matched to prevent additional stress or shock. Aquarium salt can be used at 1 tablespoon per 5 gallons of water. Dissolve in a few cups of tank water and gradually pouyr it into the tank. Treat for 10-14 days then reasses the condition. When performing water changes, treat only the volume of water being replaced, not the entire tank volume. A methylene blue dip can be done daily. You can find it in the aquarium section of the local pet or fish store. A concentration of 50ppm is recommended. Do not add it to the main tank as it will turn everything blue and kill beneficial bacteria in the filter and substrate. Use a separate container and dip the fish for a few seconds, rinse and return it to the main tank. In the future, quarantine any new fish for several days to prevent introduction of disease to existing populations.

If you have an activated carbon filter insert, remove it or it will filter out the medication. Confirm adequate water quality and chemistry since both can impact health and healing. Consider adding a broad spectrum antibiotic to treat infection. You can purchase products such as Kanaplex or Maracyn in the aquarium section of the local pet or fish store. Follow label directions carefully. Plain aquarium salt (NOT table or Epsom salt) can be used at 1 teaspoon per gallon of water to reduce stress and aid in recovery.

A photo of the fish would be helpful if you can get one. It could be infection, injury or parasites. Any new fish, ideally, should be quarantined for at least 2 weeks before being staffed to the main tank. For now, quarantine the fish. Treat with a broad spectrum dewormer. You can find one in the aquarium section of the local Petco. Maintain pristine water quality and add in some plain aquarium salt (NOT table or Epsom salt). This will reduce stress, improve gill function, treat minor infection and aid in recovery. Dissolve 1 teaspoon of salt per gallon of water in a cup or two of tank water and gently pour it into the tank. Treat for no more than 14 days then reassess the condition