Please help! pea b has ick!?

Hello all. So my pea b was doing better from when i changed the water in the tank....he is eating as usual and looks healthy....but this morning i woke up and go check on my fish and i notice he has little white spots on his head and on his fins. Also a little on his body.(looks like salt on his body) It is not severe but i want to treat it before it gets that way. The other day my brother got a baby pea b and it got ick very severly so he bought quick cure.. I put that in today but i just wanna know if someone can tell me the best way to get rid of this ick....my temp dropped 4 degrees from last night and is now at about 74. I heard this could be the reason the ick infected him....Im going to buy a heater tomorrow and bring the temp up to about 85 and keep using the quick cure....will this get rid of the ick? If not what is another method i should try to get rid of it? Also just because my fish has ick does that mean he wont eat? Thank you in advance! Please help!