Why are my goldfish sick with fin rot and not improving after water changes?

Question

My goldfish have been acting very strange and fins have been changing colors, they are swimming frantically around the 20 gallon tank and crashing into the glass as well as jumping out of the tank in general. Their tail fins have been developing a red vane work in then and is developing what looks like fin rot... I’ve done water changed twice in the last week and half but they haven’t improved at all. I have added a stress coat solution to try and calm them a bit but I’m at a loss... Pet's info: Fish | Gold Fish

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

Hi, and thanks for your question. This is a quite concerning presentation and it is likely to be related to water quality. 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. If this answer was helpful please let us know, this will be used to improve our service!

Why are my goldfish sick with fin rot and not improving after water changes?

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