Floating them gets them to not touch the side of the bag. That irritates softies and they produce even more mucous which is eaten by bacteria witch sucks up all the O2.
When it gets in blow off all the scum.
If you see any dark spots, cut them out. Cut out one polyp if you have to. Sane goes for any softy IME. Get rid of dying flesh and save what little good flesh you can. Once you stop the progression of dead material, the remainder should survive.
Tell them they need to put an ice pack in there if its getting that warm.