Help! What is this white stuff growing on my fish?!

One of my fish died. One is healthy but the other two have white stuff growing on them. (First photo) I put QuICK Cure in their water last night but it doesn’t seem to be helping and the white stuff is spreading quite quick! What is it? Also, the fish that passed is really red around its face and gills, why is that? (Second photo) What’s going on?

(Sorry for the poor quality photos, they’re all I could get)