If you added live rock plus fish in the same week, it's no surprise that you're seeing ammonia. A tank of that size can maybe handle adding one small fish every two weeks. And, live rock should never be added to an established tank unless it has been cured outside the tank, and shown to have no ammonia or nitrites.
By the way, 20 worms and brine shrimp eggs is a lot of food. Most of those brine shrimp eggs won't be eaten and will lead to ammonia. Two or three worms a day per fish should be enough.