Leave them so that they become optional for the snackers. The seeds are the hottest part. You may not want to add these. Mince cilantro, and stir in approximately 1 TBSP for each half-cup of meat. This should be done to taste.
Some people find cilantro overpowering.
My friend Mike Gallego says you should just be able to taste a fresh cut copper taste. I think you should see the cilantro nicely scattered through the civiche, but not dominating the look of it. Mix this thoroughly, and squeeze enough fresh lime juice to approx. Let the mixture marinate in the refrigerator until the meat is cooked, stirring well every five minutes. As the meat cooks, it will change from clear to white.