3 days? Wow, you got me. Something shoulda happened after all that time. After 3 days all my rocks were covered with hitchhiking zoanthids.
Just kidding. In about a week you'll see ammonia's maybe, week two your nitrites will be high and you'll see traces of nitrates. As nitrates elevate you'll probably get your first big diatiom bloom. 2-3 weeks. In about a month you may see some macro algae like sargassum peaking out of a few cracks. Maybe a worm crawling across the sand. If your calcium levels are high enough, the rocks will begin to purple up. In 6 months to a years you'll see lots of copepods, amphipods and probably tube worms.
Nothing good happens fast in this hobby.
Mike