indentify illness

Long post ahead! But any help is greatly appreciated because I seriously have no idea what to do at this point. My brother and I are both having problems with some newly bought juvenile angelfish. He has 8 (4 from person A, 4 from Person B). I have 9 (4 from Person A, 5 from Person B) in our...

So my discus seems to have gifted these orange-ish color sores the one in the right almost looked like some white thing was sticking out so I assumed parasites and an treating him which parasite meds which after 24hours I can’t say much has changed. My filter media is removed of course but if...