I'm growing six seedlings in a hand-watered hydroponic system. All the seeds sprouted at various different times. My oldest, when it hit 2 weeks, just flopped over at the base. I had read that this happens sometimes so I just wrote it off to it growing too top heavy for the stem to support and propped it up on a home-made stilt to hold it up strait. But now, almost a week later not only is the oldest still weak-in-the-stem but then next oldest started doing the same thing! Right now I've got both of them propped up but I was wondering if that's the right thing to do and what might be causing this pattern. Not sure if any of this is pertinent but here's more info on what I'm using: Started in rapid rooter then put in gro\dan delta rockwhool. Using Pure Grow Plus nutes Using tap water ph 5-6. (I'm using one of those liquid dropper test kits so I can't get an exact read). Germinating under florescent lights.