I have 3 plants Blue cheese and one is sick the leafs are drying and they have tiny spots.There are in 3 weeks of veg and this problem is from week 2.
grow box
light 1-150wCFL 6500k,3-23w 6500K,18/6
soil 6.7 ph
temp/humidity night 15C(59F) and day 24C(75.2F) 50%
nutrients Canna terra vega