zit/cyst on cory's dorsal - Page 3 - Tropical Fish Keeping - Aquarium fish care and resources
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post #21 of 22 Old 01-24-2010, 11:07 PM
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Originally Posted by Byron View Post
Some good actions noted here, well done. Keeping in QT is fine, and without any medication is very sensible with Corydoras, as I'll explain momentarily; connected to this is the fact that the pwc almost certainly saved the cory's life.

I have learned from experience over 15 years that Corydoras are extremely sensitive fish to chemicals, salt, medications, water parameter changes and water quality problems. Characins as a group are probably second in line, but Corydoras are at the top of the list. I no longer treat aquaria containing Corydoras unless it seems absolutely essential to save the fish. I have observed the exact same reactions in corys as you describe, from several different medications; the first sign has always been very increased respiration, then eratic movement, then sluggishness to the point of death. When treatment is deemed essential, I now observe the corys and am ready to do a major pwc every day if necessary.

The green is likely malachite green and/or acriflavin, both highly toxic to these fish if prolonged or in strong dosage. As for the tail fin, it may grow back; torn and missing fins usually do, though not always.

Byron.
Thank you for the heads up on corys being sensitive to those meds, Byron.

Hopefully this will be my final update to this thread.

Both quarantined fish showed no further signs of illness, and have been added to stocked/cycled tanks. In my last post, I stated that I did not believe this to be a case of myco. Main reason being that I have no veterinary skill and did not have the meds the experts advise to use for myco, and still both fish are alive and well. The cory's dorsal fin was obviously some type of bacterial infection, but healed quickly after administering common antibiotics. The nose was probably just something it did to itself after going into QT (rubbed raw) and got a fungal infection. I believe the harlequin may have just had a swim bladder infection (or possibly early dropsy), but also made a quick recovery. No other fish in the house have come down ill.

The cory was added to our 40 gal and has become fast friends with the unknown cory that came with the tank. If you're reading this, Byron, I was wondering if you'd be willing to take a shot at ID'ing the cory pictured in my aquarium pics?

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post #22 of 22 Old 01-25-2010, 02:06 PM
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Originally Posted by FrogHerder View Post
Thank you for the heads up on corys being sensitive to those meds, Byron.

Hopefully this will be my final update to this thread.

Both quarantined fish showed no further signs of illness, and have been added to stocked/cycled tanks. In my last post, I stated that I did not believe this to be a case of myco. Main reason being that I have no veterinary skill and did not have the meds the experts advise to use for myco, and still both fish are alive and well. The cory's dorsal fin was obviously some type of bacterial infection, but healed quickly after administering common antibiotics. The nose was probably just something it did to itself after going into QT (rubbed raw) and got a fungal infection. I believe the harlequin may have just had a swim bladder infection (or possibly early dropsy), but also made a quick recovery. No other fish in the house have come down ill.

The cory was added to our 40 gal and has become fast friends with the unknown cory that came with the tank. If you're reading this, Byron, I was wondering if you'd be willing to take a shot at ID'ing the cory pictured in my aquarium pics?
If it's the cory in the 40g photo, it is Corydoras paleatus, common name usually peppered cory. This was the first corydoras species I ever kept, decades ago now. There is also a high-fin variant (extended dorsal fin). Quite a nice little cory. B.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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