Originally Posted by mistergreen
Here's a fish vet working on a skin ulcer. He used a spray of antibiotics and then a 'fish bandage' over it. https://youtu.be/GCyNcsGlxjk?t=468
It's a gelling cellulose powder. Not exactly sure which but I'm thinking it might be Methylcellulose.
That's very interesting. My fish have always been a bit smaller, though.