Extremely dark green leaves

Tried googling it, can't get a straight answer so I'll ask you guys =D, 2-3 of my ladies have extremely dark green leaves and are almost like plastic (really shiney and rough). I know there is something I can add to my watering to solve this and I'm sure it's very simple/asked a million times.
FFOF 75%, perlite 25%
watered 2 times a week, once with BMO, once just plain water
under a 600w hps, and 4-500w wortha cfl's

Thanks in advance =)

Sounds like too much nitrogen, if you're using an N supplement lay off it for a week or two.

IMO- It looks like a Potassium deficiency.
Picture 2 I can see purple blotches on a couple of leaves, leaf margin is curled up on one leaf with some purple on the leaf margin.
Nitrogen toxicity, you will have lush green foliage, leaf tips usually claw, leaf tips usually burn.


Good Luck on Your Grow.