moved rocks

Im settings up another 40 gallon reef tank. Im getting the tank used its coming with some year old live rock. I want to move half of the rock from my current tank to the new one. Basically everything in the display photo that has mushrooms and zoas on it. And replace it with the other rock...

Hi everyone, Basically I left testing for 2 weeks and had a mag/cal and alk drop so I’ve just fixed that then i was looking and in the last 2 days one of my clowns disappeared fully with no trace, (the tanks only 4 months old) so I moved all the rocks looking for him, now my phosphate has gone...