For month old plants in hydro......they're rather small. I'm not familiar with Turbogarden but I will look it up and see whats its about.

My first thought is that your dry hydroton should not be dry. It's usually a medium that is kept wet 24/7 because of it's light, airy, coco puff type texture. So my first guess would be that they need more waterings. I also wonder about ph (I ALWAYS wonder about ph)....is it changing from watering to watering? Does it start at one ph and then when drained back the ph has changed? Any of those things would hint to me of part of what might be going on.

What are your ppms? Have you been calibrating your meters and checking them? If not I would do so immediately to make sure you are getting accurate readings.

I also realize that you were gone, and had some power outages so that will play a role. I still think your kids are pretty small however......more specs (like day to day what the ppms and ph do) would be really helpful in discovering if you can grow these kids bigger and quicker.