5 Deaths after water change

[Uberhoust]

One suggestion is that it wasn't the water change. For me the water change is only a part of the weekly servicing of the fish tank. I clean the area around the tank, and both sides of the glass. I always used to use windex on the outside glass and I suspect a bit of the spray went into the tank, I really don't know because I noticed that the fish were all in distress when usually the water change brings out breeding behavior, I quickly did a heavy water change again, and the fish started behaving normally again (I don't use windex anymore). The second suggestion is that you may have not treated the water for chlorine, this has happened to me, I noticed the fish in distress when filling the tank then saw the syringe I used to treat the water full and on the top of the tank and full, so quickly added it to the water. In both cases the fish recovered but I am more careful now.

 

[seangee]

Did you change the days of your water change? Our council always chlorinates on a Friday - so when I was using tap water I used to avoid changing on the weekend.

 

[FishCow]

Did you change the days of your water change? Our council always chlorinates on a Friday - so when I was using tap water I used to avoid changing on the weekend.

Not as such, I had done more water changes than usual recently as I have re-scaped the tank about 6 weeks ago.
I'm going to get some free chlorine ( not total chlorine) test tabs today to see if anything is happening with the chlorination of our water.
I won't know until I test, but I doubt it being the cause. I think something mechanically went wrong with the last change I did - filling too fast and warmer water. I don't know

Also, as far as dissolved solids go, the TDS of our tap water is pretty low @ 40 ppm. As of this morning, my tank water is sitting at 98 ppm - seems optimal.
I'll report back if I find anything after testing for free chlorine.

 

[FishCow]

One suggestion is that it wasn't the water change. For me the water change is only a part of the weekly servicing of the fish tank. I clean the area around the tank, and both sides of the glass. I always used to use windex on the outside glass and I suspect a bit of the spray went into the tank, I really don't know because I noticed that the fish were all in distress when usually the water change brings out breeding behavior, I quickly did a heavy water change again, and the fish started behaving normally again (I don't use windex anymore). The second suggestion is that you may have not treated the water for chlorine, this has happened to me, I noticed the fish in distress when filling the tank then saw the syringe I used to treat the water full and on the top of the tank and full, so quickly added it to the water. In both cases the fish recovered but I am more careful now.

A good catch on the windex. I don't use glass cleaning chemicals on my tanks so not an issue for me. I did ( and always do) dose my tank with a de chlorinating liquid (Prime). I have been advised not to wait until the tank is refilled and do it straight away in the future.
The only behavior I noted in my fish was them hiding and huddling together at one end of the tank when the tank level was low and during the refilling.
Thanks for sharing your experience