Protein Skimmer and Coral issues

[Antrias]

I got the RO unit figured out I believe. A few of the DI canisters are broken and the value is not adjusted properly and it's to tedious to adjust the "EZ-Flush-kit" value back to the appropriate spot after using it to flush. So I am ordering a regular flushkit.

This candy coral is killing me though. Everything else in my tank is perfectly fine except for it.