What's wrong with my plant?

Newbie here, riding the roller coaster that is my first grow. 4 weeks into flower and I'm seeing what I think is nute burn. Brown spots on leaves, tips curled up and brown, plants turning light green. 4 plants total, watered and fed equally. Only 2 plants seem to be affected. Planning on flushing in 2 weeks, possible to ride it out? Any insight or advice is greatly appreciated. Picture below

Probably decrease the feed and water rates on those affected. Check your solution ph too.

Don't flush 2 weeks it's no where near ready

Give it 4-6 weeks then think about harvesting

get a 60x loupe and check leaves...most hydro stores have em for 10 bucks. Ide lean towards nute burn but worth looking...could be pests.

That's not nuts burn it's a def

Nute I mean not nuts

Thanks everyone for responding. Sorry for my delay. I freaked out and flushed those two plants last week. Burn stopped spreading, however, they r going yellow on me now assuming they r using up whatever nutrients are left in the fan leaves. I have another water day coming up and I'm wondering what I should do. Light feed or let it ride? I believe them to b about 3-4 weeks out now and am concerned I significantly impacted my final yield by flushing early. Also, the other two plants that weren't initially affected are now starting to get burnt tips. I haven't added any CaMg as I've been using tap water. Could this actually be some kind of deficiency?

Thoughts, suggestions, advice anything is greatly appreciated