My Coral

[Timothy young]

My corals are doing okay after killing one of them somehow I love 4 then the other one I thought I'd well I thought three of them died ones coming back to life was doing really well and spreading tell me what you think is this is going to make it this was really big and I thought it killed it but it's starting to come back to life

 

[Nathan0369]

What caused them to start to die? What are your water parameters?