How long should I wait?

[Coralgurl]

HMy 180 gl tank has completed its cycle! Ammonia, nitrites, nitrates all at 0 for a week now. I have diatoms and green algae has started to show up so I have added 25 snails. How long should I wait to transfer fish, inverts (shrimp and crabs) and corals from my 55 gl tank over? I also have a clam, I know they need more established systems, so I'm worried about transfering him. I have used water from the 55 to complete a water change on the 180 but its such a difference in systems I'm sure its had little impact. All suggestions welcome!