Falling of scales can be also due to parasites. If the fish was darting aswell I would keep an eye out for parasites.
Get a magifying glass and take a closer look at your fish.
Red pink prick marks and red sores can also be a sign of parasites, and excess slime.
Also look in to tb symtoms and keep a close eye on the fish for signs.
Thanks, for that. Have been looking into TB and they haven't got most of the symptoms so hopefully not that! Will take a closer look in a minute though although another fish now has a large bloated stomach so not looking too good there