Deficiency diagnosis help!

Hi guys, I need some help with diagnosing the problem in the pictures. To give you an idea of the situation, I am 7 days into my flower cycle and have started noticing these marks on some of the leaves..... They are spread out on different points of the plant, one or two at the bottom, a few in the middle and a couple at the canopy. I change my pots every 7 days and always maintain a ph of 5.9 - 6. I am using Sensi Bloom two part A + B and giving it 2ml per litre. The lights are not too close and the temperature of the grow room never goes above 27 degrees celcius.

My questions are these:

1. Will this deficiency effect overall yield and quality?
2. What exactly is it and can I fix it?

I appreciate your help..

Thanks

2ml a litre could be a little high, In DWC can run with a lot less nutes spec if your grow room temp is 27c have you got a decent digital EC/PPM meter? take reading each day see if your plants really need 2ml a litre.

Thanks for the reply. I do not have a good ppm metre so having to play it by eye. I will dial it down to 1ml pl for a while and see if that helps.

I noticed this morning that a lot of my leaves were covered in water. I think it may be condensation in my grow tent. Not a huge problem now but when they start to bud I'm going to have real problems. My day time temp is around 27 but at night I am dropping as low as 10. Do you think it's worth sticking a heater in there to maintain a temp over night? Or perhaps a dehumidifier? What is the ideal night time temp? Thanks guys.

Not sure what the deficiency might be but I had something that looked like that on my last grow. It came up around week 5 of flower but was only on the plant leaves that were directly under the light. Tried cal/mg at first but that did not seem to help. The plant never showed any other signs of a problem and finished completely fine.

The water on the leaves comes from transpiration/condensation. Better than a dehumidifier would be a fan blowing over the canopy. That "deficiency" might be due to burns from the water and lights?
I think the day and night temps should ideally be within 10-15 degrees F of each oth

magnesium.. give a little cal-mag to help with it