allsps40 nothing but respect...that said let me take a crack at this. I had something similar to this 3 months ago. whitish brown corals, bad pe bad color.
The turning point: I added some hydor koralias for more flow and took out alot of rock that was blocking the flow in my tank. I took rocks out. also used very minimal LR, inserted the inside of the rock with the rods to form my aquascape.
Lost some coraline, a blenny literally MIA. Lost my crab but guess what??? All the color in all of my corals was like the day I bought them in about 2 months.
I also tested my lights with a par meter found out I had 190 par on the high side, not nearly enough. Switched lights and have had issues in bleaching my corals but a bit not major LEds are powerful. Thats on me.
Suggestions:
Invest in a 3 part doser or a 2 chamber calcium/mag reactor. I like the 3 part stuff from brs its real easy to do even manually. Test your water and the you can enter your water volume on the reef calculator on the brs website and voila your dosage appears, spread it out to get to your designated level. ALK, MAG, CAL test often.
Flow, kick it up if you have 3,500 gph of flow in your tank or higher your about right if not fix that you need to chop up the top of the water line a bit I notice this helps the skimmer. My skimmer sucks, this is also important a skimmer that is borderline overskimming for sps. Mine is borderline weak sauce but has its good days. Hope this helps its my experiences only take it lightly. All set ups are different,
Stop dosing stuff. Unless its calcium, magnesium or Alkalinity dont dose anything, your not there yet.
If you have buddies that have sweet tanks ask them "what do you do?" I will testify that all the people I know who have picture worthy tanks I'm talking about real displays!!!!... stuff you dont see too often. Anyway they will tell you "just my calcium and mag and alk." "And feed the fish." Thats it!!! Why cause its consistency!!! Thats what we all like even you and I. So we dont get stressed out, corals are the same. Same today same tomorrow and stop tinkering that upsets everything. No more dosing what tom said cause its not helping. Vodka is tricky it helps somethings but ****es of zoas, and other lps but in moderation will help the nutrient issue if you have one remember if isnt skimmed out your just adding more crap to your already crappy water column.