Celestial Pearl Danio illness

[broodmetbeleg]

Hi,

My CPD seems to have large white/less colourful spots. He didn't have them before. It doesn't look like fungus, as it looks smooth and not fuzzy and it looks too large for white spot. He is acting okay, hiding quite a lot but nothing else, still eating. Two days ago my timer broke and the light was left on for like 3 hours longer than normally. Could it be stress? Or do you think it's a disease?

Unfortunately I don't have any better pictures or videos than these, he is hiding and my aquarium has crazy reflection. He seems to be the only one affected, the others are very active. 

My parameters are:
No3 - 10
No2 - 0
GH - 8
KH - 3
pH - 6.8
Cl2 - 0
Temp - 24 celsius

[TheSwissAquarist]

I had this problem and the spot eventually spread and killed the fish after I isolated him in a QT tank. Try Maracyn or Ich-X, it seems to only be superficial.

[Colu]

Looks like columnaris it's a gram negative bacteria infection it can kill in 24hr to 7 days depending on the stain and it's highly contagious the most effective treatment is kanaplex and Jungle fungus clear fizz tab's containing nitrofurazone following this treatment plan @broodmetbeleg

Edited October 7, 2022 by Colu