Another Growth or bleaching question?

So far my system has been running good and corals have visibale growth looking very happy so I purchased a few frags of SPS to test my luck. Superman digi which was givin to me without looking blue and it remains more brown than blue.. i hear its very hard to get them to have a blue base? Well after a week or so it has white tips, crappy iphone pictures below but these were taken after lights out, i turned on the WHITES only because the blues make it imposible...alk at LFS was about 10 drops which is too low but on my year old nutrafin test i got 17-18 drops sooo 180ppm correct ? All param are stable and acceptable plus i have full polyp extention, temp is about 78-79 maybe 80, All Cree LEDS at about 50% blues and 20% whites right now (still looks very white ) okay lets get to the point :-X basically growth or bleaching?

The monti cap is doing good, the green birds nest is doing great (higher up than the monti), acro is fine and well the Birds of paradise is the problem.

 

I see nothing wrong with any of those corals. Looking good.

 

Its hard to see but the paradise has white tips and the digi as well, i was wondering if its growth