The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
Easy answer is you will need to wait before added new fish. Your current tank has a bacterial population so if your transferring the LR, substrate and water, your not starting from scratch. But there is not enough to handle a 150 gal and you may have some die back during the change.