If the seed cap is on, you can spray with a water bottle and the moisture will eventually help remove the helmet on your tomato seedling.
Are you using new or old seed? What are storage conditions for your seeds?
If you are using old seed, you could use Carolyn's seed wake up method with miracle grow or another dilute fertilizer.
If you are using new seeds, your seed storage conditions may be drying them out. (One possible idea.)
Outside of that, I don't always get 100% germination right away. Sometimes seeds are slow to germinate. It can be a combination of both slow and fast seed germination for the same seeds from the same batch.
Are you using a humidity chamber? How deep are you planting? What is your seed source?
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