Name this malady...if you can

[z_willus_d]

Hi,

I've been fighting what I assume are various forms of mildew and fungus on my indoor (garage) garden for over a month now since the humidity kicked up (and the plants started to crowd one another). So, I've lost about 1/3 of the branches on 4/5ths of the plants (I have 12). Now the four or so plants that actually have some tomatoes growing on them are starting to go down, but with a slightly different malady to my eye. Their leaves curl up, dry up, and then turn dark. I've been spraying regularly with Daconil, but it hasn't seemed to help.

When I examine the underside of the afflicted leaves, I find that they have a white/pink/magenta ting of what seems powder (though it doesn't rub off) around and along the veins. The pics I've posted don't do a great job with the color (phone camera), but hopefully they'll spawn some ideas. I've devoted loads of time, not to mention $$'s on this indoor garden experiment, and so far no real results. My best hope is in keeping these four Rosella Purple plants living long enough for them to deliver something.

What can I do to fight this problem? Thanks for your ideas and help.

--naysen