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Fish/Sick flower horn fish

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Question
Hi Jordan,
I am from Sri Lanka.I hope you could help me. I had about 10 flower horn fish which I bought about 4 months back. They were all doing well for some time. Two pairs even spawned recently. Suddenly one day I noticed one fish with a swollen eye, it gradually became very swollen and was protruding. Additionally this condition was followed with erosion of the jaw. The mouth sticks out. I treated with tetracycline. It didnít answer. Still the fish was eager to consume food but was unable to do so due to the swelling on the mouth. However this flower horn died. Then I noticed a few others showing the same symptoms. So I treated a pair that was affected with one eighth of a 250mg Zinnat tablet. The one that was very sick died but the condition of the other one slightly improved. The surviving one still has a very swollen eye. Erosion of the jaw still persists. However it is eating now. Another pair is showing the same signs from yesterday. As for this pair it all started with a sudden appearance of a  bump on the head then swelling on both eyes or one eye and the mouth sticking out. What could be the reason for this. This disease seems to be spreading. I am devastated. Can this condition be treated. Appreciate if you could advice what type of medication I could use. Thank you.
Nayani

Answer
Hello, Nayani You need to treat your fish with an antibacterial. That is the only way you can clear up the symptoms. I have to warn you though, this disease (which is known as pop eye disease) is deadly in most fish. I wish you the best of luck on treating the rest of your fish. Any that are not sick right now I would advise you to isolate and move to a different tank.

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Jordan Gobely

Expertise

I can answer most questions about fish care and maintenance. I am not an expert on saltwater aquariums but I am researching more about them on a daily basis. I have kept many different tropical freshwater fish as well as cichlids. Brackish water is my weakest category but if you have a question feel free to ask and I will do research on it myself.

Experience

I have kept fish for over 10 years. I am also an employee at a pet store and the head of the fish department. I am going to school at Emporia State University and studying biology with a concentration in ecology and biodiversity for undergraduate work. Right now my job is to care for and maintain the fish department at a local pet store. As far as water quality, I am well versed in different practices you can do to help improve conditions and what levels to look out for when testing the water.

Education/Credentials
I am majoring in Biology at Emporia State University and have researched fish reproductive behavior for the past decade.

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