Corydoras wont stop dying

[bianca_m35]

This needs to be looked into. Corydoras fish should never be floating after a water change, nor even be near the surface. I suspect that whatever is behind this is the issue. This could be one of several issues.

I mentioned that bacterial problems with gravel were dangerous for cories. Do you dig into the gravel to vacuum it during the water changes? I know you said you did this time, but what about previous water changes?

What are the GH and pH of the source (tap) water, compared to the tank water? If there is a significant difference, this might be the issue (or part of it).

Yes I vacuumed into the gravel. I do everytime because of how much poop the corys and snails create.

Gh is 8 and pH is 7.8 out of the tap.

The corys are fine now. Like i said they only do it when I change the water they're really never near the surface. I don't understand why because they don't do it otherwise.

 

[Bruce Leyland-Jones]

The eggs are in a breeder box. Most are fertilized as well.

Sorry, you misunderstand me.
Any growth of baby fish will be dependent upon the quality of your water.
At the moment, that quality appears suspect and will remain so until the cause of your Cory deaths has been identified.

 

[Slaphppy7]

What kind of test kit are you using? did you get the Seachem Prime yet?

Are you matching the tap temp to the tank temp, as closely as possible, when doing WC's?

 

[bianca_m35]

Sorry, you misunderstand me.
Any growth of baby fish will be dependent upon the quality of your water.
At the moment, that quality appears suspect and will remain so until the cause of your Cory deaths has been identified.

Oh that makes sense sorry!

 

[bianca_m35]

What kind of test kit are you using? did you get the Seachem Prime yet?

Are you matching the tap temp to the tank temp, as closely as possible, when doing WC's?

Api liquid test. And no I haven't. Yes I always match the temp as best as I can. It's usually a tad warmer but hardly at all.

 

[Avel1896]

You didn't answer my question

"Do you dechlorinate the water with any water conditioner ?"

 

[bianca_m35]

You didn't answer my question

"Do you dechlorinate the water with any water conditioner ?"

No but there's no chlorine in my water I've tested it a few times.

 

[bianca_m35]

You didn't answer my question

"Do you dechlorinate the water with any water conditioner ?"

I'm answering a lot of questions and it's very hard to see all of them so sorry if you took it as I'm not answering you.

 

[Avel1896]

I'm answering a lot of questions and it's very hard to see all of them so sorry if you took it as I'm not answering you.

No worries

 

[Slaphppy7]

Api liquid test. And no I haven't. Yes I always match the temp as best as I can. It's usually a tad warmer but hardly at all.

A "tad" warmer (5 or 6 degrees F) can kill fish...I found out the hard way

No water conditioner? Are you certain your source water is not chlorinated?

Use the API test kit, and test your tap for ammonia, nitrIte, and nitrAte

 

[bianca_m35]

A "tad" warmer (5 or 6 degrees F) can kill fish...I found out the hard way

No water conditioner? Are you certain your source water is not chlorinated?

Use the API test kit, and test your tap for ammonia, nitrIte, and nitrAte

Yes its not chlorinated.

Just tested it

Ammonia .10 about
Nitrite 0
Nitrate 0

 

[bianca_m35]

Yes its not chlorinated.

Just tested it

Ammonia .10 about
Nitrite 0
Nitrate 0

So I guess there's a small ammonia spikes. Interesting since I just did a 70% water change and used the nitrite ammonia conditioner

 

[Bruce Leyland-Jones]

Yes its not chlorinated.

Just tested it

Ammonia .10 about
Nitrite 0
Nitrate 0

Whilst your water may well be free from chlorine/chloramine, water conditioner also removes heavy metals and other potential water contaminants which can be harmful to fish.

 

[bianca_m35]

Whilst your water may well be free from chlorine/chloramine, water conditioner also removes heavy metals and other potential water contaminants which can be harmful to fish.

Okay ill get a water conditioner then as well

 

[Byron]

No but there's no chlorine in my water I've tested it a few times.

This certainly needs looking into...are you are city water or a private well?