ok... my mate in Hobart has a med size Blue in his tank....same as us.... no apparent issue... oh and a brown tang too... all seem happy enough.Had a chat about it to one of the guys at Williamstown and he said he wouldn't put one in there no matter the size. So................I came home with a chunk of live rock for the mt, a "moon" coral (favites?) and two coral gobies for the nano and they are already taking small flake food :)