Help!!!!!! Top Stems are flimsy!?!?!?!?!?

I don't know what the hell happened yesterday she was all perked up and earlier today she was perfectly fine. But after work I came home and found that she was all bent and soft. I don't know what the hell is going on. The only difference I gave her 1/2 teaspoon to gallon of water at 6.5 PH. I added two clone plants in the cabinet. That is the only things different. earlier I was giving her 1/4 teaspoon to gallon of water. I'm using Fox Farm Grow Big Nutes. please help!!!

here's some pictures of the bent stems and a pic of how she looked yesterday.

do you have any kind of circulation system on them?? maybe that would help

yeah I got a 265 cfm hydrofarm exhaust blower, and fans in the cab.