Yep bump temp to 80F
Add airationi.e airstone attached to air pump, (warmer water less oxygen)
Add anti-whitespot meds ( if in uk try interpet number 9 i think anti-whitespot)
Add 1 tsp per gallon every 12 hours for 3 days in a row. (ONLY IF NO SCALESS FISH ARE PRESENT I.E CORIES, CATFISH, ANY FORM OF TETRAS, PLEC'S)
And pray like mad, the later you leave it the less chance of recovery!!!! ICH spreads like wildfire every 12 hours!!!!!!
Goodluck
Bigfish.
I suffered an ICH outbreak with my 9 fantails they all survived but it was touch and go for awhile. You might notice that their fins will rot away with ICH but use MELAFIX to fix that.
Keep us posted
check levels of ammonia, nitrite and nitrate as these will tell you how your water is affecting your fish.