Zombie Bride DWC

Running at 4th week in bloom. Everything is going well except few tops have bit pale on leaf tips. Mostly on tops which are super close to fan, have to try to move fan to different position (hard in that small tent where is not much free space). Could also be lack of nutrient, im running quite low ec, maybe i try to raise it little bit. Led is running about 80% power and DLI is set to 38. Also slowly trimmin leaves and popcorns under the canopy.