just did a water change on my 72g and i am not sure what went wrong. i had 3 zebra danio in it and 1 died about a half hour later and the other one was gasping for air at the top and is now freaking out and not swimming right. this one will most likely die sadly. the third one is doing completely fine. checked everything after and ammonia was 0 nitrite was 0 and nitrate was i think 20. i matched the temperature perfectly and added water conditioner about a gallon or 2 into the fill. i used these fish to cycle the tank and they were completely fine throughout it. i would say i did a 25% water change. what could i of possibly done that killed 2 fish in thirty minutes and an hour. this was the first time i was adding water right from the shower head and didnt have to squirt the conditioner into buckets. could i of added too much conditioner? i was hopin this time i would not lose any fish, even ones i used for the cycle. thanks in advance
water change gone wrong?
- Thread starter johnny819
- Start date
Well adding water and then treating once in the tank adds a risk for more delicate fish. Did you change the brand of conditioner. Do you run on city water treated with chlorine and fluoride? It's not really optimal to add water and then treat the tank. If you can you want to treat the water and then add the water to the tank. Maybe someone else can chime in to help
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i still have the same brand and i also run on city water. there was only a gallon or two that went into the tank before i added the conditioner. i asked people how they did it when they added water right into the tank and thats how they told me to do it. thanks for the input
Well that's how I do it to but were your fish already unstable? I usually do this to all my tanks unless it's fry or delicate species then I fill with pre treated water in that case
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My first thought was that you may have suffocated your fish by doing to large a water change with unoxygenated water, but I doubt a 25% water change would do that.
There are really only three options I can think of that caused the death. First, you forgot the conditioner and only think you added it - I am not saying you actually forgot, just an option. Second, the water was not the same temperature - again you may have checked this, but an option. Third, something else in the added water such as dissolved metals, organic materials, etc. By what you said I am leaning more toward the third option, but the odd thing is that one fish seems to be fine. While that one fish may be the strongest of the three, I highly doubt a change that kills one, with another likely soon to follow, would seem to not phase the third.
Definitely weird, and I hope you get it figured out.
There are really only three options I can think of that caused the death. First, you forgot the conditioner and only think you added it - I am not saying you actually forgot, just an option. Second, the water was not the same temperature - again you may have checked this, but an option. Third, something else in the added water such as dissolved metals, organic materials, etc. By what you said I am leaning more toward the third option, but the odd thing is that one fish seems to be fine. While that one fish may be the strongest of the three, I highly doubt a change that kills one, with another likely soon to follow, would seem to not phase the third.
Definitely weird, and I hope you get it figured out.
Did you vacuum the substrate and stirred it up ? Happened to me before, I have not stirred the gravel substrate for a long time. When I did it, fish started going for the surface then started dying.
After consulting with LFS, she suggested that by stirring the gravel, it released trapped 'carbonic acid'. I always thought this scenario can only happen on sand substrate, found out this can also happen using gravel. Specially true if there are live plants.
After consulting with LFS, she suggested that by stirring the gravel, it released trapped 'carbonic acid'. I always thought this scenario can only happen on sand substrate, found out this can also happen using gravel. Specially true if there are live plants.
the first option i definitely did, the second one i checked the thermometer and it stayed around 72. the most id say a degree difference in the water at most and the third could be a possibility. i just think its weird that ive never had this problem before thats why i thought i put too much in
i didnt even bother with the gravel all i did was change the water. i also turned my canister off for about 15 minutes but i doubt that could of done any damage
