URGENT: My Poor Leaves, What is Wrong??

[Madurcrazy]

My Plants are currently in flower, recently switched 3 days ago. My leaves are showing brown marks and even whitish tips. I always keep my water at around 6.8PH and the plants are grown in water only kindsoil. What do I do? I don't want my buds to be ruined. I do sometimes slip with the temps by them reaching 29 celcius. I am using a 400Watt HPS and a 150Watt tasty light led together with desk fans to create a breeze and a cool tube to keep the HPS cool. Only one of the five plants show no signs of this brown spotting.

[PRIMO]

Lights to close?

[9fingerleafs]

looks to me like the ph may be getting out of range, can you measure runoff the next time you water?

[Madurcrazy]

I'm sure I could try and catch the run off from the fabric pots. If the soil PH is wrong, how do I fix it?

[9fingerleafs]

you would need to balance it tru the water you give them, meaning if its too low you give them high ph and vice versa, for this to work you need relatively hard water, whats your water situation?