Angel With Sores

Hi All,

I have 6 Angels in my 240L tank.
First one of my Platinums developed some sores on its body, and then another. Oddly enough the other Angels are fine.

I first thought it might be one of the Plecs latching on to the Angels, but I am not sure.

I have treated with Octozin last week, and as yet, there has been no improvement.

Any ideas?

Water parameters
Ammonia = 0
Nitrite = 0
Nitrate = 30
Ph = 7.6

Thanks
Squidward

Sorry, here is a photo. I am not sure why it didn't attach in the first post.

No one???

Have you tried a bacterial treatment?
Might be good to put him in a hospital tank aswell.
Is he eating?
Has he got white string poo?

I have tried Myxazin and Octozin.

Fish is eating and poo is normal.