Leaves turning light green on flowering plant

Hi I have 5 plants growing and I flower. One of them has started to have the leaves turn light green from the tips on inward. Here's the details for the grow

Type: purple.thai autoflower

Age: seeds popped sept 7 and flowering for about 6 weeks now

Soil: happy frog mix with supersoil (natures living supersoil for autos)and perlite

Pots: airpots

Water: watered every 2 to 3 days with ro water.

Other: calmag added to water at least one a week (2.5 ml per gallon)

Other: have added some compost teas 3 times since flowering

Lights: mars hydro ts 300 in 4x4 tent running 20/4. Started uv light for 15 minutes yesterday

Tent temp: 78 to 82 daytime

Humidity: tent was around 35 to 40 rh and recently its been 40.to.45 rh

This change in the leaves i just noticed today.
 

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