In what ways do vermiculite and perlite differ in their properties and uses? (e.g. as compost additives)?
use a rooting medium like vermiculite until they are large enough to be supported by the stems. Unless the tomato you took them from was an heirloom variety, there is no telling what sort of loveapple you might have. The only time I grew seeds I found sprouted in a tomato they had a systemic mosaic virus and never made it past a foot tall. Good luck
You'll need more than water to grow in hydroponic medium. I suggest you look into this neat gadget, the aero grow, which is a home system to do just that, fairly inexpensive. It takes care of the lighting, nutrients, timers, and all...