corals gone

[Montana]

I need some advice.
I had a 72 gal tank and all my corals were doing great. I started up a 150 with cured live rock. I ran the tank for 2 weeks with no fish just live rock, then added 2 clowns, they were fine 2 weeks after that i added all my fish , live rock and corals from my 72. then it started my clam died in 2 days then my leather,ricordia zoos and so on , goniapora and starpolyp the only thing left. all my fish are fine,nitrates .1 ph8.3,ammonia0, cal460,dkh12.
all ro water the only thing i can think of is phosphates because of the algae bloom i had 2 weeks prior to adding the coral; but i did a 10% water change and added carbon and chemi pure phosguard.all my levels are thwe same in this tank as the other tank i even used about 40% of the water from the 72 ,

any ideas would be appreciated