Hi need some help to diagnose my plant

[zfreezez]

Strain - indica Peppermint kush - barnney farm seeds
# of Plants - 1
Grow Type - Soil
Grow Stage - Flowering (4-5 week)
Bucket Size - 7 liiter (2 gallon)
Lights - (2) 50W led light
Nutrients - Biobizz
PH - 6.5 (+-0.2)
RH - 50% to 60%
Room Temperature -25-31 C
Solution Temperature 25 C
Room Square Footage - 60 X 35 cm
Pests - None Known

my plant start yellowing in the upper leaf its start with the leaf that was close to the light (the led light is 25-30 cm from tops) the leafs cruling down and become dry and hard, break easy.
I flash the plant but i dont think its help...
Thanks
i add some photo

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[NuttyProfessor]

too much heat ad have you give cal/mag . when growing led cal/mag is very important

 

[zfreezez]

i use all biobizz Nutrients and stimulant - alg A mic have cal and mag (0.01%)
will spray the leaves with alg A mic(something like 1 ml per liter) help for immediate treatment ?
you have any other solution?