Mg deficiency? Advice needed to avoid destruction

Hi all, so I threw these 4 seeds into some backyard soil (FYI, I'm growing in India in a place where the soil tends to be VERY rich, and where commercial "potting soil" is not available) in the pots they're currently in (about 6x6x6in) with some fertilizer a few weeks ago. I started them out in the sun but then we had about 2 weeks of rain so I brought them in under 24hr CFLs (probably not enough, but they've been growing at an acceptable rate). Temperature is on the high side, between 80 and 90 degrees F., and there's not much I can do about that. Humidity is also rarely below 65% and often up to 100%. I always keep a fan trained on the plants. No nutes so far, except a bit of coffee grinds to help with nitrogen during veg. The problem is that I went out of town for the weekend and when I came back they looked awful. One is particularly bad, and most of the photos are of that one. But they're all yellowing along the tips of the lower leaves, spreading to the upper leaves, and the edges of the lower leaves are brown, necrotic, and on one plant twisted as well. After some research, this looks like a magnesium deficiency, but since I currently have no way to test the pH of the soil it's hard to figure out what's going on. Today, I watered them with some magnesium sulfate so if it is an Mg problem hopefully that will do them good, but I'd appreciate the thoughts of some more experienced growers (pretty much everyone is most experienced than me!). Cheers. ==cleisthenes [URL=http://img259.imageshack.us/my.php?image=10gg5.jpg][/URL]

they are burning, not starving. methinks the coffee grounds are too much...

Thanks kindprincess... I'd be inclined to accept that theory if it weren't that the plants seemed to be showing signs of this even before I added the grounds. In my newbishness, I assumed that the yellowed look of the leaves (and the slight brownishness at the edges of one of the plants, which is all it was at the time), implied that they needed nitrogen, which is why I added them in the first place, they weren't part of the original mix. It's possible this has hurt them more, but something was definitely amiss even before I added the grounds.

they are definitely burning, too much fertilizer. you should be alright, but i'd go with just plain water until they show signs of improvement.

Aye, but everything is complicated by the fact that I'm in a rather rural part of India where the nicely packaged nutes we get in the states are not readily available. I've been hunting all over for a Ph meter, because I suspect that the PH has something to do with the problems. I'm shocked that it's an over fertilization problem, though... maybe I added too much to the original mix.

i doubt it's ph. looks like an od of nitrogen.