This is a work of art, incredible colors, composition (and photos), in addition to difficult to keep corals technique. Congratulations!
There was old question on p3, about corals ID, the soft coral is scleronephthya, and yellow gorgonian could be - I'm not sure - yellow morph of Muricella plectana, this coral has very specific appearance. Mariusz621 at Ultimate Reef has pink morph, me too (frags). You may know me as Dendro982, BTW
What you can try, if you want, it worked for me:
Dendronephthya: I lost two of them the same way, in days, but now they survive (short term observations, sorry, but this already a progress, comparing to fast death) - even damaged - after some changes:
alkalinity is in low range, feeding - close to continuous, twister-like flow in the corner, allowing food rotate around the corals for longer time, flow - close to 200 gph (760 l/h), reflected.
If you will found something during your research, that can can be used in low tech, low cost, nano-size setup - minimalistic approach - post too, please, for us to use. Or particular care for some of corals.