Hi all...I noticed that my upside down catfish, Thor, has this oblong white patch on his underside. He recently had ich, which was treated successfully. This is not in the form of spots, but a "filled in" area. He has begun to skim the glass, eating algae, i assume. I'm wondering if anyone has any ideas as to what this might be. He is acting perfectly normal, eating, swimming, hiding....this area was not present 2 days ago....help. Thanks guys and gals! 



