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[Joe bucko]

What disease is this? what should I do to treat it? 

It's a panda corrydoras

I do have plants and nirite snail possible some pond snails too

Edited April 26, 2022 by Joe bucko

[colo3000]

Looks like a fungal or bacterial infection. People will often use aquarium salt in a hospital tank as a first step to treat these types of infections. Here's an Aquarium Coop article on treating fish with salt. Corydoras are scaleless and more sensitive to salt, so be careful not to dose too much. Salt will kill aquarium plants, so make sure you use a hospital tank.

Edited April 26, 2022 by colo3000

[Colu]

Looking at the white patches could be Columnaris or over production of the slim coat caused by a parasite or bacterial infections what I would do is treat with kanaplex and jungal fungas clear fizz tabs containing nitrofurazone together following this treatment schedule I would remove your nerite snails as nitrofurazone isn't snail safe

Edited April 26, 2022 by Colu

[Joe bucko]

Thank you everyone for you advice  I treated the fungal treatment i got from the the aquarium  store in Edmonds. I did the week as recommended symptoms  went got better after 2 days and un noticeable by 5. I did have left over medicine  that wasn't enough for a full second week so I did 2 extra days nothing seems to be negative  effect. (Possible my octopus plant  was effected but I think it might be a mineral deficiency  I have some similar  symptoms to other plants l)