It's possible that the one cherry tomato is going to be a loss, that there's something wrong with it. However, to my also untrained eye (at least so far as the color balance goes with your camera), those just don't look right. My petunias are deepest green with some purple tones, and the salvia are turning that color.

Here's some data I found online, a thread on Another Site: Click here for more information

Another one: Click here for more information

The two ideas I like are a weak decoction of Epsom salts and adding calcium. I'm wondering if that isn't a magnesium deficiency, and spraying the leaves sure isn't going to hurt. The sulfate would also help suppress any disease there. I'd recommend 1 tsp per gallon, sprayed, to start.

Calcium absolutely isn't going to hurt any. If you have Milorganite left over, a scattering over the surface would help. Gypsum would work--just a tiny pinch, a wee amount.

*Edit* The other bit of data I noted was how heavily tomatoes feed, which I hadn't realized. You just fed, that hasn't had time to process yet. Most seedlings don't feed very much when young, and grow a lot slower than yours are doing (mine, at 3 weeks, are about a tenth that size).

Michael Wise wrote:One more question. What about my fan?

It is pointing away from the plants, and is just pulling a very light breeze over the plants. So light you can barely see the leaves wiggle if you stare long enough. It is running any time the lights are on.

Can that be a problem?

It's actually recommended. I'm going to add one as soon as I get my third and fourth true leaves on the new plants, pointed directly at them (I have a lot to do, so I'll set it on sweep). The stems benefit from the wind causing wiggling, which slows growth a bit but makes them much more solid.

Not having it leads to leggier plants that aren't very strong-stemmed. That increases the chances they'll break when moved outside. Stockier, stronger plants are much better.

I tell you what. With me, and I think that first link said it, too, the more I try, the worse things get.

Tru dat. Everything you do is a stress, no doubt about it.

This is my first shot at maters, and I keep hearing and reading "watering problem".

Right now, I know they have water. I'm gonna ride this out and see what happens when I know things are a little drier on the inside. Just to 100% rule that out.

That makes sense. Overwatering is the #1 killer of young plants. Like I keep saying, I use 1 quart bottom watered, about 8 ounces sprayed over the top at seeding time. I watered the petunias and salvia once so far, but I end up pouring away fully half of that.

I really feel that this is some rookie problem that I am causing.

Could be, and I don't know tomatoes. This is my first year with mass seedlings, although I've raised them indoors before in smaller numbers. I don't have anything that grows at that rate!

My tomato friend up the road has been gone, and I don't know anybody else that grows stuff. It's been nice having help and someone to field my questions.

Shrug, for what help I am. I can suggest, but don't really know, and have to go on visual clues that may or may not apply to seedlings.

If it's any consolation, I've lost six plants so far out of 130 started at this point. Some losses are to be expected, and some plants are a little harder to start than others. Maybe the SS 100's are just tougher.