Thy are comming up great,but just die before they are an inch tall...
is there any sign of fuzz on the dirt? Do the seedlings suddenly wilt and die? Is your soil very wet? These are things that all lead to damping off - a mold/fungus develops and wipes out seedlings.
There are a couple of things you can do today. Put a low fan on to circulate the air around your seedlings. Second do you have any cinnamon powder? It works as an antifungal naturally - just shake the cinnamon all over the seedling tray and leave the stuff on top of the soil. This might help. I can't see an image of your tray so I'm just guessing from experience.
Please let me know how things turn out.