Pics are too blurry and improperly lit to tell anything useful.

Try to get clear pics (set camera on something solid) under natural light. What is your pot size relative to the plants? What is the pH of your RUNOFF?

I see no evidence of tipburn from overfert. But you still may need to flush before you start feeding again. Get that runoff number.

You do know that with CO2 you should be running your temps higher? Bump them up to 80-85'F.