Originally Posted by kane chisholme
Thanks everyone, and trust me, I did put alot of the dechlorinater stuff in but unfortunately it didnt do a whole lot but it may have helped as it's now the next morning and 10/21 affected fish survived which I wasnt expecting. Before the fishes death, they behaved exactly as you described Byron but the only info I can give you on the dechlorinater stuff is that it was like a blue liquid that you put in the tank and it's suppose to "eliminate harmful chlorine to fish" sorry but I chucked it out last night because it was empty
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That does sound like chlorine poisoning then. I've been through similar. In the 1980's I lived in a city that had good source water and very little chlorine was added. Those of us with fish did water changes without a conditioner, with no issues changing up to 1/4 of the tank. Then one summer, a bacterial bloom in the reservoir caused the city to increase the chlorine. None of us knew, and that week's water changes saw a lot of fish deaths by many of us. We learned the hard way: on city water, always use a conditioner.
I had another experience in 1997 or 1998. I always do a quick check of the fish once I finish a water change on each tank, to make sure the filter is running after I've switched it and the heaters back on, and just to see how the fish are behaving. I finished my water change on the 70g and got the Python draining the 90g. I looked into the 70g and there were all the fish, at the top, red gills flared, gasping, a couple floating dead. I instinctively knew that I had forgotten to squirt in the conditioner when I started filling the tank. I grabbed it, squirted in probably 4 times the normal amount, and saw instant relief from some of the hardier fish. They all recovered fortunately, but a few of the more sensitive fish didn't, they were too far gone.
As for your conditioner, I am not familiar with any that are blue, the ones I've always used are clear or opaque. Without the name can't say much about its effectiveness. Might be worth switching to another brand.