First indoor grow with my clone - leaf diagnosis request

Cannabudz

Member
Hi All,
Newer member (March/2020) & first time post. Been reading a lot, getting educated.
First grow underway and coming along nicely. Indoors 600W MH (approx 24” above plant uppermost leaf) 18/6 light schedule. Small fan for air movement.
Triple cheese clone started Apr. 12th in 18/6 light cycle since then.
Watering every 3 - 4 days. (When the 9” pot feels light)
HST: May 4th had 5 nodes, cut at 2nd node to grown additional clone.
Room temp fluctuates from 65’F to 77.8’F. Humidity range 36% - 56%
Growing in soil - black gold mix.
Watering with RO water & 3ml Cal-Mag/gal. PH has been 6.0 - 6.8
Last watering (May 18th) wanted to start to introduce nutrients: 3ml Cal-Mag(2-0-0)/2ml Kind Botanicare Base(4-0-0)/4ml Kind Botanicare Grow (2-2-4)
Soil PH 6.7 at roots
Based on the feeding chart this amount seemed like a safe amount to introduce.

Issue: Dark spots on several leaves. Many stems are very red.
Suspect maybe over water or phosphorus issue.

Thanks for the help!
Budz
 

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