Well, 5 days of blackout today and most of the red stuff has died but there's still some still alive, hopefully my Turbo snails will finished the job.
I just saw one of Ryan's from BRS home tank video where he shows his rockscape with a lot of the same type of stuff that I have in my rocks and also mentioned that after a year he still can not keep any SPS alive in history tank.
He finally decided to add sand to his tank and after that, things has turned out for good. Maybe I just need to add sand to my tank too.
Here are some pictures of my tank after the 5 days blackout.
One thing you could do is add a bag of ocean direct into the sump. You can put it in very fine filter sock mesh bags or similar. This would add some diversity.