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Anna, Pet Expert/Biologist
Category: Pet
Satisfied Customers: 11238
Experience:  40 yrs.: herps, pocket pets, rabbits, poultry, dogs, horses. Biology degree. Vet assistant.
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I have got a black Molly ,which I think I might have

Customer Question

Hi there
I have got a black Molly ,which I think I might have accidedly injured when transferring him into thr tank.his eyes are more swollen than before and he can't see.he is bumping into things.the food passes him by.he sometimes is able to scoop it of the water surface,but I think he is not getting enough.i have put Melanie into the water,but with no improvement.his eyes appear to have cloudy fluid in there anyway that I can help him?
Kind regards
Submitted: 1 year ago.
Category: Pet
Expert:  Anna replied 1 year ago.

Hi Marianna,

My name is ***** ***** I'm a biologist with a special interest in fish. I'm sorry to hear your fish is having this problem.

My first suspicion for what you have described is what is called 'pop eye.' This is not one particular disease, but a symptom that can be caused by several different things. It can begin with an injury that gets infected. Sometimes it is bacterial. In that case, it is recommended to treat with myxazin. Melafix is not strong enough to deal with these conditions. Since such infections are the most common cause of these eye conditions, I recommend treating with myxazin as your next step. If you can't find it locally, here is an online source:

It can also be the result of a vitamin A deficiency, but if you're feeding a good commercial food, that is unlikely. It can also be related to fluid build up. Kidney failure can cause fluid to accumulate behind the eyes. Excessive nitrogen gas in the water can be another possibility. This is most likely in tanks where there is a lot of agitation of the water with power jets. Fish do also get actual tumors, which can put pressure on the eye from behind. A less common cause of these problems is a parasite infestation. If the myxazin doesn't help, you can also treat with an antiparasitic, such as Praziquantel, on the outside chance that parasites are to blame. But you'll need to do a couple of water changes first. Don't use the two medications at the same time. If there is an organ failure, nothing you do will help. If there is an actual tumor, an aquatic vet can remove it, if you want to go that far to attempt treatment. If you want to schedule a visit with a fish vet, this link will take you to a directory:

Or, in the UK:

If you have more questions, let me know in a REPLY. I hope you'll be able to save your fish.


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