looks like white spot
my prefered treatment is to increase the temp and add protozin as per the instructions, its a treatment course of approx 1 week
edit:
just noted you are in USA, not sure what med is available there for ich, but whatever it is get some, its still early afternoon there isnt it? get some now, treat the whole tank, cross your fingers - good luck
edit2:
oh and... if you do lose all your fish, keep on with the treatment course, and start a fishless cycle before restocking slowly and carefully