Cast Minnow Fishing
columnaris disease?
Hello,
I have a 29 gallon tank that is currently inhabited by
1? snail
1 plecostamus
4 whitecloud minnow
2 corydorus
1 neon tetra
5 Rummy nosed Tetra
2 Hatchet Fish
2 Endlers Livebearers
In the past week, I have had 5 penguin Tetra’s, 3 Neons and 1 endler die.
On the last Penguin, and the endler there was a little bit of white fuzz on the side of the fish. The colour of the fish almost had a metallic greenish cast.
Water conditions are good, I have an Eclipse filtration system, and live plants. My tank does have a little cyanobacterial growth. I have added salt and reduced the temperature. Is there anything else that I should do?
I am afraid to medicate in case I have made an incorrect diagnosis.
The first question I would ask is if the white fuzz was on the fish before it died or after. A greenish cast wouldn’t be unexpected on a Endler or even to some extent a Penguin tetra, so be careful not to read too much into that. Even so, Columnaris rarely shows any discoloration away from the site of external infection so I would be more inclined to say it’s velvet rather than columnaris.
The best way to diagnose columnaris is the shape of the wound or infection site. Columnaris always grows in a perfect circle radiating from one central point. Once larger enough, you can tell that the inside of the circle is red. Columnaris often starts around the mouth or gills of the fish, but that’s certainly not a reliable diagnostic tool as columnaris can occur anywhere on the fish and in fact can be an internal infection as well as external.
Velvet on the other hand is a parasite which causes a discoloration on the fishes skin as it infests more and more of the fish. Typically this discloration is yellowish to gold in color, but rusty red to greenish colors have also been associated with velvet infestations. Use a flashlight to look at your remaining fish very closely for any fuzzy growths or discolorations. If you see discolorations but no wound or growths, I would say it’s velvet. If you see wounds and / or fuzzy growths look carefully to see if it’s round or not. If not, it’s fungus, if round it’s most likely columnaris.
The best treatment for velvet is a good ich medication containing copper or malchite green. Treat the same as if you were treating for ich. Yes, you will need to remove your snail and treat at a reduced level for the corys. This treatment can also be very hard on plants so you may wish to remove them as well.
If you need to treat for fungus, use an over the counter fungus medication. Most are pretty good. The above mentioned ich medication will also treat most fungus infections.
Columnaris is best treated with an antibiotic called Furanace ( generic name Nifurpirinol). It is currently the best available for external columnaris and the only antibiotic so far proven to treat internal columnaris. (it will also clean up the cyanobacteria for you) This treatment will also kill your bacteria that you want in the tank and will require you to recycle the tank.
If you need any additional help with diagnosis or treatment, please feel free to email me at magicman116@yahoo.com
Best of luck with it
MM
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