Help what could it be

[cloud237]

 

[NuttyProfessor]

looks like sore case of calcium or bug damage
need info
ph
soil
lights
feeding
watering
ect ect ect

 

[cloud237]

Ph 6.0 ocean farm soil and 4
65 Watt - CFL - 250 W Equal - 6500K feeding fox farm products watering every other day

 

[Peripatera]

You need more dolomite lime your soil is acid and causes calcium problems even if your soil bag says it has dolomite you need more it's not enough for cannabis plants.

 

[Major PITA]

Looks like calcium deficiency to me too. 6.0 PH is low for good calcium uptake.
If yo need to water every other day, that plant should be in a bigger pot, if possible. Does it really dry out that quick?