First, let me say I think you should wait a while before adding anything...this tank has only been up a few weeks right?
If you do want to hurry things along, let me throw this in:
blood shrimp = not a good idea
start with some less sensitive and less expensive inverts. If you pay $35 for a blood shrimp and then discover there is some sort of problem in your tank (shrimp dies) you will be very unhappy...try a couple hermit crabs and snails instead. I don't know why you don't want to get snails without fish, it doesn't make a lot of sense.
also, know that shrimp really aren't part of a cleanup crew.