Fungus on nose of corydora arcuatus

[jimmiedwad]

My skunk cories are dying. Their barbels disappear and then their whole nose turns white. Its not fuzy like fungus.
I bought 24, to get this number I bought from 3 different stores.
They are in a 300 gal with wild scalar angels that I have had since june.
I went to Minneapolis to purchas the rest of these fish.
40 ember tetras
10 loricade whiptails
3 lda-01 plecos
24 cories.
I started losing whiptails and cories right away.
The whiptail deaths seam to be over. I am still losing my cories though.
I thought this was due to water changes.
My food and prime are getting close to two years old along with my test kit.
I have ordered. New test kit and prime.
My paramiters are
Low range ph 7.6
High range ph 7.4
Ammonia 0
Nitrite 0
Nitrate 0

I have only been changing about 50 gal a week. Mostly just enough to take out the poop piles. My tank has only been set up again for a couple months.
Tank is planted,i use ozmacote in gel caps and a 3 dry ferts ei method i believe.
I also have prozi pro coming
The drift wood, gravel amd any rocks have been in this tank or other before.
As I have been dealing with this I noticed 3 of my angels have black spots. Spots like you might see on lake fish in the summer. Worms

[TwoTankAmin]

Your pics are not all the clear, so I cannot offer an opinion based on them. However, what your describe sure sounds like it may be columnaris. This is also called mouth fungus (fungus is a misnomer as the disease is bacterial), or saddleback disease (because of the white coating often seen at the base of the dorsal fin).

There are a variety of strains of this disease some of which are quite virulent that can wipe out a tank in short order. Other strains of less virulent but still dangerous. If this is what your fish have, you need to use an anti-biotic to treat it.

If columnaris is indeed the problem, you will need to treat the entire tank. In 300 gals. this gets pretty costly. You may want to consider dropping the water level first as less water volume means less medication is needed.

[jimmiedwad]

thank you.