Starting from seed?

So lets say that one might start a plant from seed. They put it in a rockwool cube, that was soaked in a ph solution of 5.5, then placed in a net pot with hydroton, and placed inside a home made aero tub with sprayers running 15 minutes on and 15 minutes off intervals. After the seed sprouts out the top of the rock wool cube how fast do they usually grow? How large would an average plant be after 5 to 7 days of growth under 2 40 watt Ecolux fluoros? They are rated at like 5000k broad spectrum, with a 90 CRI rating. As well as 2 150 watt equivalent CFL's. Any thoughts on this setup or any help with what should be done would be appreciated.

you got any pics???????

Since this is a hypothetical grow, unfortunately there are no pics,

I agree rockwool is not the best thing to germinate in. I have been hydro for a while. First Hempy pots then DWC then soil/perlite,gravel layer to DWC, soil, and hydro. The soil is the only one that is really giving me problem at this point. Hay snake nice tits... Dealing with some really strong stress with the plants.

when you're flooding every 15 minutes, you'll keep the rw soaked which is not a good thing for seeds

I germ in paper towels in a baggie, after that I put them in a 1 1/2 rockwool cube that I split and then close. I don't put them into a system until there are roots showing from the cube. How big are they after a week? Not very big, be patient. I agree with Zem, I think that what you are proposing is too much water but, I have never tried it. Good luck.