How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Joan Your Own Question
Joan, Vet Technician
Category: Pet
Satisfied Customers: 18654
Experience:  Vet Tech for 35+yrs. Small Animals and Fish
Type Your Pet Question Here...
Joan is online now
A new question is answered every 9 seconds

I went to feed my three-year-old betta fish and realized he

Customer Question

Hello I went to feed my three-year-old betta fish and realized he died overnight. He experienced fin rot and had a small white dot on his body that seemed to spread to his top fins however I did a water change and I treated the fresh water w diff chemicals as I've always done. Is it possible that I may have killed him with the water change I did about three days ago. I was just trying to help him but I may have overdone it. I have pictures I don't mean to be morbid but I don't want to make the same mistake again I feel pretty bad if it's something that I could ever prevented
Submitted: 2 years ago.
Category: Pet
Expert:  Joan replied 2 years ago.


My name is ***** ***** I have been a Vet Tech for 30+ years and a fish keeper over 40 years. What you are describing sounds like the illness took its tool on your Betta. Once they are ill they are very stoic and hide it until it can no longer be hidden. Even with the water change being done correctly, the stress may have been to much for him. Water quality may have been an issue. When we change the water completely we can see Ammonia and Nitrite spikes and with a very ill fish, the immune system is down and the water spikes can shock the system and kill a fish. This is nothing you had done, wrong but the underlying illness that you described. I suspect there was a water quality issue that caused the original illness and fin rot. This is very common in Bettas, since most people do not use filtration or areation. I hope that this information puts your mind at ease. If you would still like to post the pictures, I can look at the, but pretty sure the death was the result of a Water Parameter Spike. If I have addressed your concerns, Please Rate my Service 5 Stars.


Customer: replied 2 years ago.
Hello thank you so much for your response. I did struggle with water equality and I cycled through several aquarium heaters as most did not last very long nor sustain the temperature of the water consistently. I would like to send the pictures again I don't want to be morbid but wonder if you could further diagnose his illness from the photos. I did end up getting another betta yesterday but I'm going to pay. Closer attention to the temperature. I purchased pH strips do you recommend anything else I should buy to test water quality. Do I test the water quality and from those change the water, or change it once a week. I do have a heater and filte and thermometer. Thank you
Expert:  Joan replied 2 years ago.

Please post the pictures. I suggest the API Master Test Kit. It is the most reliable and will give you true readings.

The Ammonia should be 0, Nitrites 0 and Nitrates 20 ppm or less. PH 7.0. Never do a full water change. Only artial at 50% and then 25% after that. The tank has to cycle.