My goldfish has white film that comes and goes. What's wrong?

Question

I had two goldfish, one died. The other started to grow this white stuff which covered his eyes like a fog. When it got bad, we replaced some of the water. The fish was fine but it came back & faded away w/out any replacement of water and now it's back again. Is this a fungus or what? The white stuff never reaches far off the fish, it just seems to grow glaze over the scales. Any suggestions on what it is and how to handle this problem?

Dr. Massimo Orioles, DVM, Cert AVP, MRCVS · Accepted Answer

This could be a fungal or bacterial infection. Saprolegnia type of fungus are fairly common and can cause commonly these signs. The approach must be radical in your case as water quality can actually be a predisposing factor for this type of infection. Begin by submitting a water sample for quality testing. Most pet stores will do this for free or a nominal fee. Clinical examination should always include a water quality check, even if you have done so already. Water testing should be performed with a quality test kit, measuring NH4, NO2 and NO3. High ammonia levels, PH imbalances may be responsible for these signs. Oxygen concentration and quality of the filters should be determined as well. If water quality is good and there are no major imbalances, your fish should get examined to look for any sign of bacterial/fungal infection and eventually water should be treated. Hope this answer was helpful, but please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further.

My goldfish has white film that comes and goes. What's wrong?

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