04-18-2011, 05:52 PM
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I would suggest watching all corys in that tank very carefully. If you have a quarantine available this would be a good time to get it ready. There is a good chance this started out as a virus, for which there is no treatment... however, the obvious bacterial and fungal infection can be treated. (about a 75% success rate) This is common in corys in some areas, and the very reason why all fish should be quarantined for at least 2 wks before going into a main tank with other animals.
Take note of the store these fish came from and do not buy anymore corys from there in the future. If all of the tanks in the store run together with filtration, use the same nets, cups, etc in all tanks, or even have employees going from one tank to another without sterilizing hands and such first... then you don't want fish from any of those tanks.
If you wish to treat the remaining corys in a quarantine tank as a preventive, please let me know and I can talk you through it. It is best to catch these things before they get as severe as in the photo, because by that state it is usually too late, the fish are too far gone to survive even with medication.
Please keep us posted.