Plant leaves yellow with black spots? Pics

My plant is about four weeks old... 3 inches high. its white widow

Its growing slow i know


coco coir.. cana a&b nutrients......125 watt cfl

I just watered yesterday

On some of the lower leaves the edges a re a little bit yellow and some have tiny black spots on them... the pics dont really show the spots but they are there

Should i trim some of the lower leaves? and what is a causing them to yellow? magnesium deficency?

i was thinking a potash deficiency

how much of what and at what pH is your feedings

hexthat said:

i was thinking a potash deficiency

how much of what and at what pH is your feedings

Click to expand...

im feeding it canna a and b... 1ml of each.......... i water thuroughly every 4-5 days... its bottled water about 5.7

Only the best for my lady