Most sensible people put their seedlings in rock wool cubes and soak them in nutrient solution; I opted to put my seedlings directly in my 13-gallon tanks. It's a waste of nutrients, but at this level of dilution - and this scale - I don't mind much.
Hydroponics sounds like a pain in the ass, but it's not that bad. The worst part is having to sanitize the tanks between grows. I use FloraKleen and hydrogen peroxide in equal measure, run the system for 24 hours, then drain and refill.
The roots don't yet extend to the bottoms of the net pots - this is the only week where I run water up to the level of the clay pebbles. There is the danger of soaking the Rapid Rooters, or leaving salts in the pebbles, but in practice I've never had a problem.