I am currently in the process of combining my 125g, 60g and 29g biocube into my new 180g. I am going very slow, just adding a few pieces everyday. As for the fish, I am putting in the least aggressive first and then will introduce the tangs and other aggressive critters a few weeks later. If you have the benefit of keeping all the tanks up at the same time i would suggest a slow move like I am doing.
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.