Cory Catfish Has Red Marks.

My Albino Cory has red marks on body? He seems happy but I have been treating tank with Microbe-lift Artimess Incase it’s a bacterial infection? Anyone else notice this on their Albinos?

 

I can't really see the red mark. Is it behind the gill? My goldfish have one too and it's either an ulcer, parasite or ammonia burn maybe. Do consistent water changes and see if it starts to heal. Maybe a saltdip

 

 

Looks quite healthy. Think you see veins through its skin.

 

My albino BN has similar markings