My betta fish has white fuzz on its tail. What is it & how to treat?

Question

Hi there I have a betta sorority in a 15 gal tank... It was cycled prior to adding fish as well as conditioned, they have fake and live plants, heater and filter water levels are normal tank water is clear but my one betta fish has been pretty docile and has a white fuzz (cotton like) near tail just wondering what this could be and what I can do to treat her and if it will be a harm for any of my other fish as they are having no issues. Thank you. Pet's info: Fish | Unknown - Fish | Female

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

Although a picture would help to determine the underlying cause of it, this problem could be caused by an early stage fungal or bacterial infection. Achyla and Saprolegnia fungi and ich disease (Ichthyophthirius) are the species that cause the most problems together with bacterial infections (fin or gill rot syndrome). I would approach the problem radically anyway. Isolate the fish affected in a hospital tank and 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 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 betta fish has white fuzz on its tail. What is it & how to treat?

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