Action needed, Plz diagnose these pics

[growdisstuff]

Next box plz.

growdisstuff Reviewed by growdisstuff on 11-27-2007. Action needed, Plz diagnose these pics Next box plz. Rating: 5

[growdisstuff]

the 2 on the left are the same plant as are 3 on the right a diff plant

Soil- Miracle grow
PH- 6
temp now is at 77
Humidity goes from 20 to 50 depending.
Watering now a litre and quarter every 2 -3 days, to each plant. Water sits that long.
They are 3 weeks since seeding exactly.
They were growing fine untill about day 9 when I noticed the leaning plant started yellowing, In the picture it doesnt look as bad but whever the light green is on that plant thats where the y ellowing is, on top and between the veins. Notice how the plant hasn't grown as much as the straight one lately, it slowed when the yellowing started. Leaves are also a bit smaller, sorry for bad elevation on pics. Next thing that happened was the plant tipped over, I watered and it slowly brought itself back. Day 15 is when I turned on the matal halide exactly one foot away. The room shot up to 87. The next day after turning it on I decided totake action on the yellow and assume Iron, zinc, or maganese. So I added 1/4 of what directions said with what was 2 8 4. It had chelated zinc and iron and some maganese of some sort. And while I was watering with nutes I noticed that the leaves were curling upward and had the start of some minor burns on a couple leaf tips. So I bought some more fans and broughta it down to 84 with the light 20 inches away. Still burning increased in diff spots as you can see in the first pic on left side leaves. SO I rose the light anouther 6 inches higher and changed the ventilation that brought the temp to what it is now. The leaves dont look nearly as curled up as they did now. And it is exactly one week since I hooked that light up.
So my problem is the leaves are yellow on one of my plants and the other one slightly but not nearly as much, also the growth is stunted a bit. My second explanation was PH so I bought some hygronated domalite lime which I plan to add at my fellow growers concent. Today I noticed a yellow crispy spot i in the centre of one of the leafs on the droopy plant. It is very slow but I am afraid and want it cured, should I add the lime, It has lots of calcium in it that I dont want nute burn, also how much would I add.

[Indico]

I don't know really, but to me a liter and aquarter ever 2-3 days seems like a wee bit much for those small plants.