Help. First grow. plants dieing overnight rapidly!!

hello this is my first grow and it was going so well i have two plants and overnight they just started to die rapidly. i did have an aphid problem so i used a foliar feed with a dawn and water solution. but that was two days prior and i also watered a lot the night before it happened. Here are some pictures of each of the two plants plant one has a lot of yellowing and burnt tips while plant two has yellowing and some sort of heat stress i believe with the leaves curling upward…please fill me in on what you guys think i am new and am in week 3 of flowering very excited now I'm so disappointed and nervous any info would be great thank you!!

Give them some water

She's pulling magnesium and nitrogen from the lower leaves so take those nute levels up a bit. Not sure what is up with the purple bud formation.

looks like CA and MG def to me

Thanks guys ya they seem to be doing better I gave em some water and both some more nutes I'll continue to monitor and ya the purple bud this is weird hopefully it's a good thing lol