Corals turning almost white

[CandyCane]

The kenya's have been white since I first put them in the tank in July. The zenia and the frog spawn turned white about a week after I put them in the tank.

Salt: 1.023
Temp.:78F
pH:Unknown- I dont have a test kit
Lighting: Actinics 7:30am to 7:30pm
Day lights 8am to 6pm
I have no cyano or byropsis

On a side note my acropora died even though it had high water flow and top of the tank for lighting. My RBA has only its red colouring left when it used to have some green at the base, it now has a white base.

Last water change about 2 weeks ago nothing at all changed, everything stayed white or colourful