I noticed that all my 4 plants are turning to Dark green . I didn't even started feeding them yet. I'm using 2 Small grow boxes for 4 Plants . 2 plants / 1 box . each box have 2×23 Watt CFL 2700k and 2×10 Watts strong chip LED providing white light 6000k . I'm using a POTTING SOIL with mild nutrients . and Tap water . which have 6.8 ph . please help me guys since it's my first time to grow and I'm worried . plants look super healthy just sudden Darkened green leaves . Just turned in to 12/12 . I'll upload some pics for u guys