Sounds exactly Like What I had going on, I transplanted my month old plants, and my 3 week plants (from seed) into fing 3 month feed miricale grow, of course right before I read that this was the wrong thing to do.

, I also had moved them into a micro grow (from the wondow seal) that got way to hot around 90/91 degrees.
And my gorgiously health, yet small plants. turned alot of brown and droopy, , I thought alot of this was from the heat and the transplant, now one it all yellow, and top leaves actually stand almost strait up, witch looks almost disturbing. Rest are just continuing to yellow and die. I still can fig whats the right Medium to use, so I am just gonn get some MG made for tommatoes tommorow

. (havn't searched here in the right places I guess/ time. I don't really mind loosing the 8 plants I have left that I wanted to flower soon, couse they were like regs, But I have some mids/great regs that are styarting to grow. germing that I want to make heathy.