Root color

[GpsFrontier]

Something I remember also, and is also why I asked about them being started plants or bought. When I first set up that NFT I used store bought soil plants, rinsed them near to death to get as much soil off as I could.
I had to completely flush my system out after that, I don't remember how long it took, but it really messed things up.

I usually use store bought plants if I can find them because I am just impatient and don't want to wait for seeds. I haven't had that problem yet, though I have noticed if the plants are root bound in the container they are much harder to wash off and clean. Especially without damaging the roots. I don't know if that was in your case but just thought I would mention it.