Coral dying, need idea

[Shanzao]

Also... a small diatom bloom.. is still a bloom your tank is very new. I would watch your feeding its not ready for any kind of over feeding and there could be spikes going on here. I normally get diatoms when the tank is over a year old and sand or media needs cleaning / changing.

 

[Shanzao]

I had my zoa colony in qt for about 2 weeks with old lights and noticed no improvement. The qt was filled with water from the old tank that I had from a water change.

I could get the qt filled with new salt water but it would have to wait a few days, unless I don't do my water change in big tank tonight

This is just to rule out your lights and water quality, if its literally empty then adding the water and a few LR from the other tank will rule out one of the issues but not solve the picture. Take one of the problem corals back to its "healthy" home and see if where it came from makes it better. What lights do they use? Im reading a lot of posts here, over the past few days that I am "back in the hobby" with LED and I thought they were a savior! Im actually quite worried hence I added a post about lowering and lifting them Or reduced / increased output over the day.