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Possible Fin Rot on Julii Cory? Please advise on treatment!


LDNMollies
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I brought 6 Julii Corydoras home from my LFS yesterday, put them into quarantine, and fed them live bloodworms hoping to fatten them up before medicating. One had what I thought was an injured Pectoral fin and possible injury to his swim bladder. I put him into a separate nursery tank I was preparing that had already been medicated with Methylene Blue, hoping to prevent infection. This morning he had passed away, and I noticed that a few of the other Corys now had large portions of their fins missing and fraying. Other than the damaged fins, I have not seen any signs of the remaining 5 acting unusual. They are resting together in their shoal and traveling up to the top of the tank for air. I am guessing this is fin rot, but I have never dealt with this before with my livebearers.

The picture I added is the one who seems to be in the worst shape. His entire tailfin has completely frayed away.  I have added aquarium salt to their tank at half the usual dose; although, I know there is conflicting information about how sensitive to it corys really are.  On hand, I have the Quarantine Trio, Methylene Blue, API Aquarium Salt and Malachite Green.  In the past, I have known people to use Maracyn 2 for Fin rot, but I can't find it anywhere at a reasonable price or that could be shipped to me in time. Will regular Maracyn work? Should I go get Malefix from Petco?

Water Parameters:

  • pH: 7.2
  • Nitrates: ~15 ppm
  • Hardness: ~200 ppm
  • Nitrite: 0 ppm
  • Ammonia: 0 ppm
  • KH/Buffer: ~40 ppm
  • Water Temperature: 79.1F

juuli.jpg

julii 2.jpg

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