Can't pin point this leaf problem. Help!

[bluUz]

plants were good and all of a sudden they got this (pics below)

both plants in pics same strain but problem looks somewhat diffrent.

Fed same day, same evrything.

soil, ph 6.6,

Nutes Canna Floress, Agent Bulk.

 

[JJ Bones]

Try getting pH a bit lower around 6.2-6.3 range. Also if possible how hot is the temps? Temps on leaves? You can buy laser point thermometers these days to get more info. Are you using any sort of Cal-Mag nute?

Looks like a combo of nute/heat stress possibly.

 

[bluUz]

lol jj u on my other post too just come thru and help me grow haha

i think it was heat stress cause i feed them the same but we had high temps 90+ in my state last week.

should i flush them out? and if i do should i ph the water (im using tap)