What is wrong with my plants?

I'm new to growing and expieriencing ALOT of problems. My leaves are turning yellow from the outside in, the tips are curling and turning brown, one has white spots on a leaf and I'm also wondering why the main stem on one of my clones is purple. It's a train wreck strain and is about three weeks old. I use my own mixture: about half happy frog half coco grow and I water with a mixture of 1 ml cal mag 5 ml biobiz 1-0-6 and I was using 1 ml of super thrive but now using only a half a ml. My ph going is 6.9 and 6.5 out. I did just start with the nutes and they are about two months old...like I said I'm new. I try to keep the temp at about 78 (indoors) my light is 125 fluorescent and two 50 flood halogens to keep warm (& I have starts n clones trying to root) the environment isn't permanent though. I'm moving them to my closet in my office, right now they are sitting on a small table and a chair at different levels because they are in different stages. What is it I'm doing wrong? See my pics for my setup