Can I use tetracycline or doxycycline to treat my fish's ulcer?

Question

How to treat ulcer in aquarium fish by antibiotics ?....Can I use tetracycline hydrochloride or Doxycycline for this condition ?

Angel Alvarado, LVT · Accepted Answer

Either may work to treat ulcers which are caused by bacterial infection. Pristine water quality is just as important, if not more so, than medication. Elevated ammonia or nitrite levels can be stressful as well as toxic. A stressed fish is more likely to become ill. Use a home test kit or submit a water sample for testing. Aim for 0 ppm ammonia and nitrites, with nitrates at 20 ppm or less. If your fish are salt tolerant, you can use aquarium salt (NOT table or Epsom salt) in conjunction with an antibiotic. Dissolve 1 teaspoon of salt per gallon of water in a cup or two of tank water and gently pour it in. This will improve gill function, reduce stress, treat minor infection and aid in recovery. Treat for no more than 14 days then perform a partial water change to decrease salinity. Use only conditioned water that is temperature matched to prevent stress or shock.

Can I use tetracycline or doxycycline to treat my fish's ulcer?

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