Second Dead Body In One Week

[RedScare]

My Corys have an Illness and I cant diagnose it accurately. There is no obvious signs of illness except for slightly red fins on the underbelly and some erratic swimming. They are staying a little above the bottom when moving around. I took out the last dead body and it looked fine. A little fraying on the fins but nothing that seemed bad. When the first fish died I suspected a genetic problem because it didnt look ill.

Take note these fish are in a tank with 6 Discus and all the Discus seem fine.

Any Ideas? No pics will be posted til the next death.

[msjinkzd]

I don't know,I have been losing sterbai (one about every month to 6 weeks) with the same lack of symptoms.

[jm1212]

what type of water are you on (well, tap, etc.)?

[TwoHeadedPig]

corys, though relatively hardy, have some intricacies.

what's your temp? ph? ammonia? what type of substrate do you have?

When i first started in the hoby, i had a bunch of corys drop. the general concesus was that they dropped due to a combination of high temp and large substrate (which appeared to be damaging their barbells as they rummaged through the gravel.)

are they wild caught or captive bred? WC corys, like a lot of other WC fish, are less hardy than their captive bred counterparts.