Weird spots HELP please

Here are some picture. It is skunk#1 6 weeks and 2 days into flowering. 400watt, Advanced nutrients, co2. I noticed some weird spots about 5 days ago and i think there are more now. Does anyone no what this is. Thanks

im no expert but pretty sure thats just some nute burn, think they say you can flush, but i'd just not feed them again intill u get an answer from someone who knows more then I. dont panic though, i've seen alot worse. oh yeah of course, if they need watering go head and water, just no nutes.

btw i've heard before advanced nutrients can be a little strong, and known to burn plants if your not extra careful. like i said dont panic doesnt look that bad.

Thats what is probably is cause nutrients went up a little. Thanks guys