On dosing instructions for metro it says to dose every other day until symptoms dissapear, so how often do you think I should do water changes?I normally do 50% once a week
I believe my first impression was correct, treat with metronidazol or API general cure. It is Hex and as you can see it is contagious. Treat the whole tank, if you don't have any salt sensitive fish you can salt at 1 tablespoon per 5 gals of water along with the metro or GC. The second picture looked as though it could have been fungal but it isn't it is hexamita. Treat as I suggested and they should be fine, a little scared but they'll live. Keep the water clean with water changes between dosages as directed on the package.