I have two local lfs and both of them differ in when you can add fish ,one says as long as you have live rock in there drop some in straight away ,as the live rock will act as a fully matured filter,( did not go with that ), and the other one add your live rock and wait for the full cycling to finish and add fish takes about 8 weeks ,so I thought I would do it my way ( no pun about frank sinatra please ) if something works dont fix it and that way works for me.
