Corydoras with Red Blotch Disease?

[Evan]

My Panda corydoras have what looks like a big blister on their ventral sides right between their pectoral fins. I don’t see the redness associated with red blotch disease so I have no idea what it is.  
I’m hoping someone in the forum can identify and recommend treatment.  
Apologies for the blurry pictures. They were moving pretty fast. 

[Colu]

It difficult to tell off your picture can you get a better quality picture and what are your water parameters ammonia nitrite nitrate etc 

[Evan]

Ammonia 0, Nitrite 0, Nitrate < 20 (lots of plants, few fish), KH 40 ppm, GH 30 ppm, temp 78-79, pH 6.5-7.0

I will try to get better pics.

[nabokovfan87]

@Evan it might just be their gills/lungs.  Usually you'll see something like rapid breathing, redness.  This is similar to Otos where their gill plates can get pretty red when stressed.  Add an airstone and that might help.  Secondarily, verify temp is acceptable.  That big clear white spot, I would need to see it in focus, but I can try to compare it to the anatomy on my corydoras.

Edited November 18, 2022 by nabokovfan87

[nabokovfan87]

Found a video showing the underside of mine. Hopefully this helps.