jiepie, another one considered me a loon ;-)
tomato seeds have endosperm that feeds them during germination. non-endospermic seeds rely on the cotyledons (aka the first leaves) as their only food supply (as in peas). so yes, they are packed with food - isn't nature wonderful. You could let them germinate on grit - or as you do in the deno method on wet papertowel (not much nutrients in moist papertowel is my guess).
I you feed while they are seedlings they will grow like little "hulks" maybe, you waiste a lot of money in my opinion : water and good quality light should in a non-fertalised potting soil do perfectly fine. You could start with feeding once their first true leaves are there but even than don't spoil the plant, don't forget there is always food in whatever soil you give them.
If you added your own ripe compost they'll be happy enough.
But it's up to everyone to follow his own schemes, my plants are all very strong and healthy plants and they get some extra food once they are transplanted... moderate feeding.
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