All my fish are dying! HELP!

[exeori]

I had 11 fish in my tank, 2 Odessa barbs, 5 cherry barbs 1 Cory catfish, 2 loaches and a German blue ram.
Yesterday I added one more Cory catfish yesterday and ever since fish have slowly been dying. All the fish seem very lazy, not swimming and eventually floating around the tank and dying. I checked my water conditions and very thing 0 and a ph of 7.3. What could have caused this? I have ran the tank for about 3 months so everything is well cycled.

 

[calebmc]

What size is the tank?

 

[exeori]

75 litres

 

[exeori]

4 cherry barbs and 2 Odessa barbs have died so far

 

[calebmc]

The only thing i can think of would be a parasite in the cory cat. Other than that I don't know.

 

[exeori]

Me neither. Iv been reading and found something called swim bladder disease and the symptoms match that but I am totally lost.

 

[Coursair]

Ok so a 20g tank. I would do a PWC and add extra Prime even if water is testing fine.

Some cities flush their pipes at times or other causes to change water chemistry that we aren't testing for.

Run tap for a bit before getting new water. Add conditioner into new water before adding to tank just to be safe.

Re test tank water.

Picture of your fish ? How are they acting now ?


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[Coursair]

And your tests can't all be showing zero. Zero Nitrates ??
Seems odd.


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[exeori]

My nitrates were 5, nitrites 0, ammonia 0, ph 7.3

 

[Coursair]

Hmm ok. What temp ?

I'd still do a big PWC just because it's always my first choice if anything is wrong.


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[exeori]

It's at 81. I did a 60% water change before so hopefully in the morning they will be in better condition

 

[Coursair]

81 is very high. Less oxygen. You might very gradually reduce temp to 76-78f if some fish survive.


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[exeori]

I found what it was, the water company were flushing the pipes and when I did a water change the chemicals wiped out my tank!

 

[Delapool]

Wow - how can they do that without telling people! Did they say what they flush with or anything?