Believe me...give it some time....the hitchhikers will be showing soon enough. I only saw 2 snails when I got mine..that's it! I was waiting to see all these neat things like I had seen in other people's posts in other threads.....and I didn't.
I would say for the first 1-2 weeks, I did see a few things, but it was like one here, and one there....nothing teaming with life.
Turns out, they were teasing me, because they were all in there! Within a few weeks, I was seeing more life than you could imagine. I still can't figure out where it was hiding for all that time.
Also, please note that I have been told by many different people, that my rock was nicer than what they got from TBS. I did get awesome stuff, but in all fairness, my camera takes really nice pictures and can show it off more than some other people's.
You can blow that silt stuff off with a turkey baster. Use the baster to blow the stuff off of your rock too.