Hi all, I guess it's my turn, hehe

( ** See pictures linked below )

My plants have grown nice and high at about 4 feet so far, all green with no problems, then suddenly over the course of the week, the leaves started yellowing from the bottom up, some even drying out totally to the point where you can just crumble them up in your hands. Also, towards the top, the leaves have a purplish tinge, but there are no distinct brown or black spots.

Also, the soil has been pretty dry to the touch, even down a couple inches, so I have a hard time thinking that I over-watered. As well, some of the flowers are just spontaneously falling/breaking off from their stems. There is only one small tomato growing on each plant, though many flowers are present.

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Any thoughts? Thanks.