Okay what's the deal?

[findingnemo1]

You know just when you think you have figured it all out this hobby just spins you around some more

Okay here are the params

Calicum:450
Alk:11
Ntrate.Nitrite,ammonia:0
Mag 1100
Ph:8.1
Temp:78
Salinity:1.026

I have included some pics that you can kind of get the idea of what i am looking at.The lights are off so everything kinda looks a little sad And yes i know i need to clean the glass
Sooo 2 of my favorite corals on 2 opposite sides of the tank are losing flesh. One is the tips the other is the side of a branch.These are the only 2.
No polyp extension from the areas of where they are losing it. Nothing has changed in the last week or so.
No direct pounding flow.
Water is ro/di that is a tds of 0
Running phosphate and carbon 24/7

i Don't get it.

Any ideas?

Ist pic if you look on the right side you can see the stark white:



2nd pic we'll you can see the issue here