I noticed already in the beginning of the thread, my friend! Colony formation is impeccable! It reflects also in the whole health of the colonies. The colors are natural and vivid to the natural limits of pigment production and reflection, the real beauty of corals under real skylight in the ocean!!! T5s are the best and unique for those qualities. There is no substitution for the spectrum and photon distribution they offer over tanks up to 24" deep! Does that mean they are superior to any of the LEDs in this world? For that matter and in IMO, yes! ATI is the way to go! I still have my old Powermodule (T5 only - yes before they were built like a tank and had only T5s, no LEDs) fixtures from 2010! I just changed the reflector and it's brand new again! I also have some newer Sunpower fixtures. I love halides for shimmer and power, but the T5s have to be included with the halides too!
Here are some suggestions of bulbs for your Acros: KZ 10K and 14K (use one or 2 max per 6 bulb fixture - the 14K is called "new generation"), ATI True Actinic (use only one per 6 bulb fixture, it does a great job as a supplement light within the combo), and if you like brighter tanks, GE 65K for growth ( I would use only 1 per 6 bulb fixture!). Blue Plus is the best T5 bulb in this world IMO! I don't recommend any purple bulbs at all. To me they are a waste to those precious slots! I don't like Giesemann bulbs too much either, just not my deal. Tried many times, as I've tried some of the music when I was a kid, thinking that I could actually come to like them one day... nope. The only Giesemann bulbs I've ever liked were the old Mid Day 6000Ks and also AquaFlora over my planted tanks. Yes, T5s are amazing over shallow planted tanks too! The best! Anyways..
Please grow some extra Acros for me!
Acros I like are A. efflorescens, A. echinata, A. granulosa, A. gemmifera, A. loripes, A. humilis, A. hyacinthus, all the staghorns, etc... well, I like all Acros to tell the truth!
So happy for you!
Cheers!