What Might Be Killing My Corys

[snowflake311]

I tested my water today and ammonia 0 Nitrates 5 nitrites 0 ph 7. I did a 30% water change for them They are in a 20 Gal tank no other fish. The Temp is 72 F. This is not fair all my other fish are fine I have had some around for years. It must have to do with them being scalesless I think.

I called the water company to get a read out of everything that is in the tap water. This is what I have.

Disinfectants & Disinfection By-Products
(There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.)

Bromate (ppb) 2.1
Haloacetic Acids HAA5) (ppb) 2.5
TTHMs [Total Trihalomethanes] (ppb) 8.4

Inorganic Contaminants

Arsenic (ppb) 1
Barium (ppm) 0.012

Microbiological Contaminants

Turbidity (NTU) 0.5


Radioactive Contaminants

Alpha emitters (pCi/L) 3.22
Beta/photon emitters (pCi/L) 5.23
Radium (combined226/228) (pCi/L) 0.85

Inorganic Contaminants

Copper - action level atconsumer taps (ppm) 0.11
Lead - action level at consumer taps (ppb) 2


Additional monitoriing
As part of an on-going evaluation program the EPA has required us to monitor some additional
contaminants/chemicals. Information collected through the monitoring of these contaminants/chemicals
will help to ensure that future decisions on drinking water standards are based on sound science.

Bromodichloromethane (ppb) 2
Bromoform (ppb) 1.1
Chloromethane (ppb) 5.5

So can anyone figure out what is killing the cory cats? I feed them waffers and flakes. Something is not right. If these guys die I give up for good.

 

[pinkdolphin_113]

Okay, its probably not the water if other fish are fine. And corydoras aren't scaleless btw.

How many corydoras have died in the water?

Ornamental fish are becoming weaker due to weak strains being bred for money. This could be a result of that.
If you could buy corydoras from another area, you could compare the 2 batches.

Don't give up though!


pink.

 

[tea cup ruskey]

strains of panda cory being wholesale in the uk .. have became weekend due to massive reproductive mesures ... iv had a similar problem recently and have beleved this to be genetic. 3 type,s of cory in a well matured set up and one of the spicies just kept rolling and that spicies was panda cory scwartzi and sterbai remain in good health tep is 77f and are accompanied wiv 40 cardinal tetra

 

[snowflake311]

I think it was poor stock. Because now I have few bronze corys and they spawn I managed to raise 2 fry. My panda corys are also doing great they will spawn for me too.