yeah im in uk and will pm one of them as i want to do the right thing
im doing 10% water changes daily and the good thing is there in there permanant home with no other fish .
I've had Waterlife's Myxazin recommended for fin rot - and also Seachem Neoplex should be good, though I've never tried it (I do have some stored for when I do...)
Keep up with the water changes, and let us know how you get on!
J