Thanks everyone for the replies, I wasn't able find other threads that discuss "bubble/bubbly" skin in RC or on google (maybe I'm using the wrong key word/words?). The red stuff is not cynobacteria, it's turf algae. The algae started when I stop running PO4 media, so that I can start vodka dosing; algae problem got better once i started vodka, although haven't completely disappear yet (note: the algae growth isn't the problem since the bubbly skin condition started way before the turf algae). This bubbly skin condition doesn't seem to stop the growth of these corals; the cali tort nicely (it's one of the faster grower in my tank) faster than my blue tip slimer. That current piece was grown from 1/4" frag into that size, 1"+, in about 3-4 months, then now it start to spread out more than vertically. The oregon tort I just got a month ago, so can't comment much about it other then it's encrusting at about 1/4 of the rate or less of the cali tort.
My tank condition are as follows,
po4 = .78ppm
ALK = 12.4 dkh
Ca = 500+ ppm
Mg = 1350+
Flow = ~ 7000 gph in 200gal
po4 was tested on hannah checker, other test were with Salifert