root rot . dying from the inside

Is my girls dead? I am a first time grower. Tried switching to flower a week ago. I guess I over watered a bit, and now a few of my plants look like this. Are these dead? Any hope?

4 of the 5 plants i have have shown no growth in last 2 weeks just stagnant and it seems the leaves are drying up from . the bottom working its way to the top.of plant and feel like paper. one plant has half its water run out the bottom. only one looks like its still alive densing up . but...