Why are my edges turning brown?

All i can recommend is to monitor plants - see if issues advances ( becomes a plant wide issue especially among multiple plants ). Plants look pretty good otherwise.

Advanced issues will show necrosis at leaf.

How are your grow environment temps ?
Maybe plant isnt transpiring enough
 
Could it also be caused from the light too close? I have since raised the light and is almost do for a refill of the reservoir so I will lower the nutrition abit this time around and see what happens.
 
Not from light … im thinking temps and rh that plant has to work with on an “ auto “ water system.

Plant pulls nutes and water up plant and releases water vapor from leaf matter stomata. Higher temps cause stomata to open during hotter temps and evaporate water more frequently. Air flow across plant will help this process also.
 
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